The demoscene is going to be a good resource for that… most of the releases are real-time, which won’t help you, but a lot of them have at least been captured as video that can be downloaded.
http://www.pouet.net or http://www.scene.org
Wild would be productions that are video to start with, though you can find video downloads attached to a lot of the normal demos and intros too.
“fr-025: the.popular.demo,” for example, has a dancing shiny guy, a disco floor, a big disco ball… lots of great imagery for you to use, and includes a downloadable video capture. http://www.pouet.net/prod.php?which=9450
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