Grab YouTube Thumbnail AFTER Post?

Each YouTube video has 4 generated images. They are predictably formatted as follows 

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

The first one in the list is a full size image and others are thumbnail images.

so if you have the video url the you can extract the video id from it call your image, and to do that on posts that are already posted you can use the_content filter hook.

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