VideoMetaData.php
<?php
class VideoMetaData extends DataObject {
    private static $db = array(
        'Duration' => 'Time',
		'IsNew' => 'Boolean',
		'Catagory' => 'Varchar',
		'VideoSortOrder' => 'Decimal',
		//'Image' => '',
		'Link' => 'HTMLText'
    );
    private static $many_many = array(
        'MetaBanners' => 'MetaBanner'
	);
	private static $has_one = array(
			'Video' => 'Video'
	);
	public function getCMSFields()
	{
		$fields = parent::getCMSFields();
		return $fields;
	}
}
class MetaBanner extends DataObject {
    private static $db = array(
		'Title' => 'Varchar',
		'Description' => 'Varchar'
	);
	private static $belongs_many_many = array(
		'VideoMetaDatas' => 'VideoMetaData'
	);

}


VideoHolder.php
<?php
class VideoHolder extends Page {
    private static $allowed_children = array('Video');
}
class VideoHolder_Controller extends Page_Controller {
}


Video.php
<?php
class Video extends Page {
    private static $has_one = array(
        'VideoMetaData' => 'VideoMetaData'
	);
	public function getCMSFields() {
		$fields = parent::getCMSFields();
		$config = GridFieldConfig_RelationEditor::create();
		////$config->addComponent(new GridFieldSortableRows('SortOrder'))->addComponent(new GridFieldDeleteAction());
		$config->getComponentByType('GridFieldDataColumns')->setDisplayFields(array(
				'Catagory' => 'Catagory',
				'Duration' => 'Duration'
		));
		$gridField = new GridField(
			'VideoMetaData',
			'Title',
			$this->owner->VideoMetaData(),
			$config
		);
		$fields->addFieldToTab('Root.Main', $gridField);
		return $fields;
	}
}

class Video_Controller extends Page_Controller {
}