You will find it under Tools -> YouTube Checker.

• NOT FOUND – The video was not found on YouTube.
• DELETED – The video is marked as deleted, but not removed from YouTube.
• REJECTED – The video is marked as rejected for copyright violation, account
  termination, etc.
• NOT EMBEDDABLE – The video is marked as only playable on YouTube, and
  embedding the video on other sites will not work.

Use this plugin for checking YouTube videos.

The other plugin only checks if the YouTube video exists or not.
On YouTube, a video still exists if its status is DELETED, REJECTED or NOT
EMBEDDABLE, and the other plugin will not report those as broken links.

The plugin will scan and verify roughly 30 videos per second. If your max
execution time for PHP is 30 seconds it will timeout after roughly 900 videos.
If you need more than that, you can change your PHP runtime configuration for
max execution
time
or try the premium Video Link Checker, which has no timeouts under mod_php.

Verify those videos are in the post content. Some themes will store the video
in custom meta fields (Avada, Newspaper, Goodwork, Enfold, Sahifa, SimpleMag,
True Mag, Valenti, VideoTube, and Video Member to name a few). If so you can
use the premium Video Link Checker.

This case happens when the person who uploaded the video chose to allow the
video to be embedded, but the legal copyright holder of some content on the
video ( usually the music ) has the legal right to restrict or block the
embed. This info is currently not available through the YouTube API.

You can find the Video Link
Checker at CodeCanyon.