Add a video in the portfolio category description

See solution here: Link

smarter solution to leave the client the possibility to do it himself.

No-Chance on that.

…

Sorry didn’t find any other solution – than to check if the last string has 11 characters. All youtube IDs got 11characters.

function insert_video_by_description(){
if(is_archive()){
?>
<script>
(function($){
$(document).ready(function(){
var my_portfolio = $('.archive.tax-portfolio_entries');
	$(my_portfolio).find('p').contents().filter(function(){
	return this.nodeType === 3;
	}).wrap('<span/>');
	var youtube_video = $(my_portfolio).find('.category-term-description').find('p:last-child').find('span:last-child').text().trim();	
	if(youtube_video.length === 11){
		$(my_portfolio).find('.category-term-description').find('p:last-child').find('span:last-child').css('display', 'none');
		$(my_portfolio).find('.category-term-description').append('<div class="product-video"><iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/'+youtube_video+'?autoplay=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></div>');
	};
});
})(jQuery);
</script>
<?php
}
}
add_action('wp_footer', 'insert_video_by_description');

This to your quick css:

.category-term-description {
    position: relative;
    max-width: 600px
}

.category-term-description .product-video {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 0;
    height: 0;
    overflow: hidden;
}

.product-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

Your answer is probably purposeful.
It would be helpful to us normal mortals an update resistant solution which is presented to us. With hints here the fewest can begin something.