The article appeared for two reasons., I did not find good plugins for implementing adaptive videos from YouTube, and also since it worked for me i decided to share this experience with you.

In fact, developing another website for a client, he decided to insert a YouTube video into the article. Plugin previously used, was removed for unknown reasons from the repository and I started looking for solutions and thinking, how to solve this issue.

In order for a video to become responsive, there are a lot of examples on the Internet when it is wrapped in a separate DIV tag and styles are added to it., WordPress doesn't have this tag by default., therefore, the first thing to do is to add a hook that will work with the content part and wrap, for example, a frame in the desired tag.

YouTube Responsive Video Hook Example

<?php

add_filter('the_content', function($content) {
	return str_replace(array("<iframe", "</iframe>"), array('<div class="iframe-container"><iframe', "</iframe></div>"), $content);
});

add_filter('embed_oembed_html', function ($html, $url, $attr, $post_id) {
	if(strpos($html, 'youtube.com') !== false || strpos($html, 'youtu.be') !== false){
  		return '<div class="embed-responsive embed-responsive-16by9">' . $html . '</div>';
	} else {
	 return $html;
	}
}, 10, 4);


add_filter('embed_oembed_html', function($code) {
  return str_replace('<iframe', '<iframe class="embed-responsive-item" ', $code);
});

After creating a hook and placing it in the functions.php file or in your plugin, you can move on to connecting styles to your theme or plugin. Below I will give an example of such styles..

YouTube Responsive Output Styles Example

.embed-responsive {
  position: relative;
  display: block;
  height: 0;
  padding: 0;
  overflow: hidden;
}
.embed-responsive .embed-responsive-item,
.embed-responsive iframe {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.embed-responsive-16by9 {
  padding-bottom: 56.25%;
}

This code helped me a lot and I hope, help someone else. If it helped you, I will be glad to your comments with gratitude and describe your case. Perhaps your case will help to develop this article.. Your comments will encourage me to write more useful materials..