Most work on this site is licensed under the Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license which should allow you to do most of what you'd like to do. (Most videos have it listed at the end.)
If however, there's something you'd like to do that isn't allowed by the license, please get in touch. I'll very likely say yes.
Other than that, if you've referenced my work, I'd love to hear about it.