How to set YouTube video as featured image?

Well this is not exactly a WordPress problem / solution.

First you have to either get the video id from the video_site_url post meta or save the YouTube video id in it’s own post meta field, maybe youtube_video_id.

Next you can get the thumbnail using one of these url

http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg

Read this SO answer

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