Hello @anna_moroz ,
You can take help from https://webkul.com/blog/create-and-manage-product-file-type-attribute-in-magento-2/ this blog to create a video type attribute of product and in your custom theme override gallery.phtml by Magento_Catalog\templates\product\view\gallery.phtml and use the below code:
<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
// @codingStandardsIgnoreFile
/** @var $block \Magento\Catalog\Block\Product\View */
?>
<?php $_product = $block->getProduct();
$imageHelper = \Magento\Framework\App\ObjectManager::getInstance()
->get(\Magento\Catalog\Helper\Image::class);
$path = $this->getUrl('pub/media/catalog/product/file') ;
$path = $path.$_product->getData('video'); ?>
<?php if($_product->getData('video')) { ?>
<video height="auto" data-autoplay="true" autoplay="true" loop="true" muted="" playsinline >
<source src="<?php echo $path; ?>" type="video/mp4">
<source src="<?php echo $path; ?>" type="video/ogg">
</video>
<?php } else { ?>
<img src="<?php echo $imageHelper->getDefaultPlaceholderUrl('image'); ?>"/>
<?php } ?>NOTE: I have used attribute name as "video" so I am using $_product->getData('video')
If this helps you, please accept it as solution and give kudos.
Regards.
