Hello,

Please add the following code in the “On document ready” area in Theme Settings -> Custom JS:

if ( document.querySelector('.woocommerce-product-gallery .wd-carousel-item.wd-with-video') ) {
	const tag = document.createElement( 'script' );
	tag.src = '//www.youtube.com/iframe_api';

	const firstScriptTag = document.getElementsByTagName( 'script' )[0];
	firstScriptTag.parentNode.insertBefore( tag, firstScriptTag );
}

Then clear the cache and recheck the issue. Let me know the result.

Kind Regards