The mashing up of videos is the newest element in the mash up genre, people are mixing videos as well as re-editing movies. Famous directors have even admitted they wish they could re cut their films and provide multiple versions to the public.
Steven Soderbergh director of “Sex, Lie & Videotape” and “Ocean 11” said this about mash up videos
“I have ideas like that - video mash-ups. Some of them I've done privately. But there's no way for them to be seen legally. I wish we could come up with a system that allowed someone to do a Grey Album without having to pay millions of dollars for music rights. A system in which rights holders share profits of a new piece of work and people can access it without breaking the law.”