I tried to do a video myself of me working, with the help of friends etc, with the idea I would put it on my website when I finally got around to making one.
It was much harder that I thought it would be, and the result looked, well, very amateurish. I tried all sorts, but just couldnt get it to look anywhere near "polished" as it should be. In the end I gave it up as a bad job.
My advice would be if you're doing a video, especially if its for advertising etc, then its worth paying someone who knows what theyre doing to film and edit it for you.