<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace DcwVmObserver;

use MagentoFrameworkEventObserverInterface;

class ChangeTemplateObserver extends MagentoProductVideoObserverChangeTemplateObserver
{
    /**
     * @param mixed $observer
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     * @return void
     */
    public function execute(MagentoFrameworkEventObserver $observer)
    {
        $observer->getBlock()->setTemplate('Dcw_Vm::helper/gallery.phtml');
    }
}

<div class="admin__field field-image-vm">
    <div class="admin__field-control">
        <div class="admin__field admin__field-option">
            <input type="checkbox"
                   id="use-for-vm"
                   data-role="vm-save"
                   data-form-part="<?php /* @escapeNotVerified */ echo $formName ?>"
                   value="1"
                   class="admin__control-checkbox"
                   name="<?php /* @escapeNotVerified */ echo $elementName ?>[<%- data.file_id %>][vm]"
            <% if (data.useforvm == 1) { %>checked="checked"<% } %> />

            <label for="use-for-vm" class="admin__field-label">
                <?php /* @escapeNotVerified */ echo __('Use for Virutal Mirror')?>
            </label>
        </div>
    </div>
</div>

<?php

namespace DcwVmSetup;

use MagentoFrameworkSetupInstallSchemaInterface;
use MagentoFrameworkSetupSchemaSetupInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoCatalogModelResourceModelProductGallery;

class InstallSchema implements InstallSchemaInterface {

    public function install(SchemaSetupInterface $setup, ModuleContextInterface $context) {
        $setup->startSetup();

        $setup->getConnection()->addColumn(
                $setup->getTable(Gallery::GALLERY_TABLE), 'vm', [
            'type' => MagentoFrameworkDBDdlTable::TYPE_SMALLINT,
            'unsigned' => true,
            'nullable' => false,
            'default' => 0,
            'comment' => 'use for Vm'                ]
        );

        $setup->endSetup();
    }

}

<?php

namespace DcwVmObserver;

use MagentoFrameworkEventObserverInterface;

class Productsaveafter implements ObserverInterface {

    protected $request;
    protected $resource;

    /**
     *
     * @param MagentoFrameworkAppRequestInterface $request
     * @param MagentoFrameworkAppResourceConnection $resource
     */
    public function __construct(
    MagentoFrameworkAppRequestInterface $request, MagentoFrameworkAppResourceConnection $resource
    ) {
        $this->request = $request;
        $this->resource = $resource;
    }

    public function execute(MagentoFrameworkEventObserver $observer) {

        $vm = array();
        $data = $this->request->getPostValue();

        if (isset($data['product']['media_gallery']['images'])) {
            $images = $data['product']['media_gallery']['images'];

            foreach ($images as $image) {
                if (isset($image['vm']) && $image['vm'] == 1) {
                    $vm[$image['value_id']] = 1;
                } else {
                    $vm[$image['value_id']] = 0;
                }
            }
   // print_r($images);exit;
            $connection = $this->resource->getConnection();
            $tableName = 'catalog_product_entity_media_gallery'; //gives table name with prefix
            $product = $observer->getProduct();
            $mediaGallery = $product->getMediaGallery();

            if (isset($mediaGallery['images'])) {
                foreach ($mediaGallery['images'] as $image) {
                    if (isset($vm[$image['value_id']])) {
                        //Update Data into table
                        $sql = "Update " . $tableName . " Set vm = " . $vm[$image['value_id']] . " where value_id = " . $image['value_id'];
                        $connection->query($sql);
                    }
                }
            }
        }
    }

}

<?php

namespace DcwVmObserver;

use MagentoFrameworkEventObserverInterface;

class ProductSaveAfter implements ObserverInterface {

    protected $request;
    protected $resource;

    /**
     *
     * @param MagentoFrameworkAppRequestInterface $request
     * @param MagentoFrameworkAppResourceConnection $resource
     */
    public function __construct(
        MagentoFrameworkAppRequestInterface $request, MagentoFrameworkAppResourceConnection $resource
    ) {
        $this->request = $request;
        $this->resource = $resource;
    }

    public function execute(MagentoFrameworkEventObserver $observer)
    {
        $data = $this->request->getPostValue();

        if (isset($data['product']['media_gallery']['images'])) {
            // print_r($images);exit;
            $connection = $this->resource->getConnection();
            $tableName = 'catalog_product_entity_media_gallery'; //gives table name with prefix
            $product = $observer->getProduct();
            $mediaGallery = $product->getMediaGallery();

            if (isset($mediaGallery['images'])) {
                foreach ($mediaGallery['images'] as $image) {
                        //Update Data into table
                    $vmValue = !empty($image['vm']) ? (int)$image['vm'] : 0;
                        $sql = "UPDATE " . $tableName . " SET vm = " . $vmValue . " WHERE value_id = " . $image['value_id'];
                        $connection->query($sql);
                }
            }
        }
    }

}

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="MagentoCatalogModelResourceModelProductGallery">
        <plugin name="afterCreateBatchBaseSelect" type="DcwVmPluginProductGallery" sortOrder="10" disabled="false"/>
    </type>
</config>

<?php

namespace DcwVmPluginProduct;

class Gallery
{
    public function afterCreateBatchBaseSelect(
        MagentoCatalogModelResourceModelProductGallery $subject,
        MagentoFrameworkDBSelect $select
    ) {
        $select->columns('vm');

        return $select;
    }
}

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="MagentoCatalogModelProduct">
        <plugin name="afterGetMediaGalleryImages" type="DcwVmPluginProduct" sortOrder="10" disabled="false"/>
    </type>
</config>

<?php

namespace DcwVmPlugin;

class Product
{
    /**
     * @param MagentoCatalogModelProduct $subject
     * @param MagentoFrameworkDataCollection $result
     * @return mixed
     */
    public function afterGetMediaGalleryImages(MagentoCatalogModelProduct $subject, $result)
    {
        foreach ($result as $key => $image) {
            if ($image['vm']) {
                $result->removeItemByKey($key);
            }
        }

        return $result;
    }
}

$images = [];
foreach ($product->getMediaGalleryImages() as $image) {
    if ($image->getVm()) {
        $images[] = $image;
    }
}

$images = [];
foreach ($product->getMediaGalleryImages() as $image) {
    if ($image->getVm()) {
        $images[] = $image;
    }
}