Today we show Bob Holcomb giving a demonstration of video compositing and garbage matting in Blender. Garbage matting is used to occlude material from a video that should not be included in the final edit. Although I'm sure it's pretty common, it was the first time that I saw someone use this technique and I was intrigued by what he showed.
Bob has been involved in Blender development and has written a number of import and export filters for Blender, and lately a number of nodes for Blender's video compositor.
Note: right-click and save-as to store the files on your harddisk