Which are the YouTube video URLs supported by Video Background?

Video Background supports two types of Youtube video URLs:

These URLs can be entered in the Video URL field from the preferences page by clicking on the Settings option in the videos list.

Once there, you will find the option YouTube or Vimeo Video URL where you can paste the video URL. A preview of the video is going to show next to it. If the video starts playing automatically, then the URL entered is valid. If the videos do not play and there is an error that does not allow you to save the changes, then the URL should be checked as it is not recognized.