Tauno Hanni

This plugin prevents Youtube and Vimeo players to block page rendering. Maybe you have recognized that pages that have a lot of embed videos are loading slowly. This is caused by the vendors video players that need to be downloaded and initialized before website can be used by the user. This plugin stops this behavior and makes page load faster.
This plugin will automatically resize your videos in a responsive fashion.

Better oEmbed Video

This plugin prevents Youtube and Vimeo players to block page rendering.

johnh10

Broken Link Checker for YouTube is a WordPress plugin that will automatically validate 
YouTube embeds found in your published posts content using the official API.
It does this by extracting video IDs from each post and querying the YouTube 
API to ensure those IDs are still valid. This is a MUST for any video 
site that wants to retain their visitors and not annoy them with broken 
content.
The truth is videos are uploaded and removed frequently – either by the user 
or the site itself for usage violations. If this happens to a video you have 
embedded on your site, your visitors are going to see broken content instead 
of the video they expected. Don’t let that happen.
Quick Summary:
<iframe loading="lazy" class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/jxc6ioU0WJ0?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Broken Link Checker for YouTube

Will automatically validate
YouTube embeds found in your published posts content using the official API.

Better oEmbed Video vs Broken Link Checker for YouTube