http://www.grainger.com/Grainger/items/1MAJ2I have used a camera like this. It has a highly flexible end and is very small. It is nice when you are trying to find where the bees are in the wall.
It takes an accessory from Rigid to hook it up to a camera or computer. I have never tried it that way.
I borrow this from one of my friendly plumbing contractors when I need to.
Sincerely,
Brendhan