Eirudo

A lightweight plugin to embed YouTube videos while keeping the correct aspect ratio — all with a simple shortcode.
<ul>
<li>Very simple shortcode. Use it in posts or widgets.</li>
<li>Uses the default YouTube iframe embed, but fully responsive.</li>
<li>Custom aspect ratio if you want a different video size.</li>
<li>Automatically centered, so your video always looks neat in your content.</li>
<li>Lazy load support to improve performance.</li>
<li>100% free — no ads, no trackers, no funny business.</li>
</ul>
<h3>Arbitrary section</h3>
<h3>A brief Markdown Example</h3>
Pros: 
1. Simple and lightweight — one shortcode per video 
2. Lazy load support 
3. Extra parameters available for advanced users
Cons: 
1. Designed for simple embeds only (no playlist support, one video per shortcode)

Simple YouTube Responsive

Perfect

You can add a line to your functions.php to make videos responsive if you're doing your own theme. However, if you're not, this plugin works beautifully and gives other options like lazy load, etc. 

If doing your own theme, add: add_theme_support( 'responsive-embeds' );

Works Beautifully

Easily embed responsive YouTube videos using a simple shortcode. Lazy load included.

Alec Rust

Gutenberg block and Shortcode for embedding YouTube/Vimeo videos, in a way that prevents users easily accessing the underlying video.
This is useful for example when embedding an “unlisted” video as premium course content behind a paywall on your site.
Features include:
<ul>
<li><a href="https://plyr.io/" rel="nofollow ugc">Plyr</a> player used to overlay default player with custom controls</li>
<li>Player modifications to always prevent clicking the default player</li>
<li>Encodes video ID in HTML to prevent finding it via “View Source”</li>
<li>Settings page to e.g. configure the player theme to match your site</li>
</ul>
<a href="https://protected-video.alecrust.com/" rel="nofollow ugc">View Player Demo</a>
Note: This only provides a basic level of protection. Technical users may still be able to access the underlying video.
This plugin is open source and contributions are welcome <a href="https://github.com/AlecRust/protected-video" rel="nofollow ugc">on GitHub</a>.

Protected Video

Very useful innovation for the course building community!

Makes YouTube More Usable in Online Courses

Thanks, Alec for the great work, a very useful plugin!
You deserve a million 5-stars reviews!

A very useful plugin

YouTube/Vimeo player that prevents easy sharing of the video.

Simple YouTube Responsive vs Protected Video