Are we permitteed to download videos from this sight and if so how can it be done?

I'm sure theres a way but I don't know how to do it. Since you'd be using someones else's work, the right thing to do is ask their permission.
I would think similar rules apply as music downloads. I had some one steal my work and use it as anti hunting material. They got threatened with a law suit but quickly took it off the Internet. Not saying you'd do that but it couldn't hurt to ask. The worst they could say is no. ...just a thought !

Better seek permission first. I also had one of mine taken and wasn't to impressed. It was removed as well when requested. Mine was used for advertising another hunting web page. If the guy would have asked first I may have considered letting him use it, probably for free. After the fact it would have cost him some fees to continue to use it.

E-mail the author and you may get a better quality video to use as well. Don't rely on the the author not seeing it, HF.com has thousands of eyes that can report to the originator of the video. That's how mine was found.