RE: Why you video?
I started doing it just because I like to watch wildlife in its element. Then the more I did it the more fun it was to try to capture an excellent hunt and kill on video, especially by yourself (and reference the shot location before blood trailing the deer). And it kind of passes the time when you get to tape the little deer since you're not going to shoot them.
One great thing that came from this for me was making a DVD and sending it to my little cousin who loves deer and turkey. He absolutely loves it when he gets a new hunting DVD from me. And that in itself makes it all worth it.
I actually found a used camcorder like mine and picked it up and gave it to my dad. He was skeptical but he enjoys it for the same reasons as me.
I am pretty much my own little one man hunting show because I shoot (bow) and film from my stand all by myself.