If you want to get an idea of how the add-in works, Pablo has posted a short video:

 

 Pablo suggested skipping to about 4:40 into the video to see the actual solution. For more information on the add-in, check out the blog: http://blogs.msdn.com/exscientia/archive/2008/03/25/short-video-clip-on-the-add-in.aspx

-Brian