I've seen a few videos where there is a background added in the video, and then someone is just playing guitar or whatever in front of it.
Here's an example:
[VIDEO]http://www.youtube.com/watch?v=eRCFqXYy9Ko&feature=player_embedded]Heavymetalizer Shreddadelic - Original Composition - YouTube[/VIDEO]
Does anyone know how you put these backgrounds in videos?
Greenscreening the original shot, most likely
edit: OMG 1:07. wtf?