UjW0L

This plugin lets you to display Youtube widget on sidebar with the themes that supports sidebar and Footer
It displays video and playlist of your choice with video id and playlist id. 
It also lets you display all videos from you youtube channel with option to navigate to next nd previous button. 
No google API key needed. Uses Youtube rss feed.
You have choice between single video , playlist and channel.
Note:

Simple Youtube Widget

Plugin that provides users option to display Youtube Widget on the Sidebar or Footer

WonderPlugin

Wonder Video Embed
WonderPlugin Video Embed is an easy and powerful way to add videos to your WordPress. You can embed your video to the sidebar widget, WordPress posts and pages. It supports YouTube, Vimeo, Wistia and self-hosted MP4/WebM videos. The video player is fully responsive and works on iPhone, iPad, Android, Chrome, Firefox, Safari, Opera, Internet Explorer and Microsoft Edge.
Features
<ul>
<li>Support YouTube, Vimeo, Wistia, iFrame and self-hosted MP4/WebM videos</li>
<li>Work on mobile, tablets and all major web browsers, including iPhone, iPad, Android, Firefox, Safari, Chrome, Opera, Internet Explorer and Edge</li>
<li>Fully responsive</li>
<li>Insert videos to sidebar widget</li>
<li>Insert videos into pages and posts</li>
<li>Play in lightbox popup (working together with our premium plugin <a href="https://www.wonderplugin.com/wordpress-lightbox/" rel="nofollow ugc">Wonder Lightbox</a></li>
<li>Auto lightbox popup on page load</li>
<li>Auto close video popup when the video ends (support YouTube, Vimeo and MP4/WebM videos)</li>
</ul>
Use in Gutenberg Editor
<a href="https://www.wonderplugin.com/wordpress-video-embed-plugin/how-to-use-wonderplugin-video-embed-in-gutenberg-editor/" rel="nofollow ugc">How to use the plugin in the Gutenberg editor</a>
Quick Start Video
<iframe loading="lazy" title="How to insert Videos into a WordPress Page/Post" width="750" height="422" src="https://www.youtube.com/embed/ycMBLd1T7bw?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<iframe loading="lazy" title="How to insert videos into WordPress Widget" width="750" height="422" src="https://www.youtube.com/embed/mV0ME4GQDEA?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Wonder Video Embed

Embed MP4, Youtube, Vimeo, Wistia videos to the sidebar widget, WordPress posts and pages.

Simple Youtube Widget vs Wonder Video Embed