public function getGalleryImagesJson()
{
    $imagesItems = [];
    foreach ($this->getGalleryImages() as $image) {
        $imagesItems[] = [
            'thumb' => $image->getData('small_image_url'),
            'img' => $image->getData('medium_image_url'),
            'full' => $image->getData('large_image_url'),
            'caption' => ($image->getLabel() ?: $this->getProduct()->getName()),
            'position' => $image->getPosition(),
            'isMain' => $this->isMainImage($image),
            'type' => str_replace('external-', '', $image->getMediaType()),
            'videoUrl' => $image->getVideoUrl(),
            'video' => $image->getVideoUrl(), //This is new
        ];
    }
    if (empty($imagesItems)) {
        $imagesItems[] = [
            'thumb' => $this->_imageHelper->getDefaultPlaceholderUrl('thumbnail'),
            'img' => $this->_imageHelper->getDefaultPlaceholderUrl('image'),
            'full' => $this->_imageHelper->getDefaultPlaceholderUrl('image'),
            'caption' => '',
            'position' => '0',
            'isMain' => true,
            'type' => 'image',
            'videoUrl' => null,
            'video' => null, //This is new
        ];
    }
    return json_encode($imagesItems);
}