The Hero has loads of mounting options. The vid I linked to was taken with the Hero using the helmet mount. this is a plastic base with a rubbery foam underneath and a couple of straps that loop round vents in the helmet and then lock into the base plate via some toothed, hinged flappy bits. Once on it simply does not move at all and is rock solid. I was really impressed.
Here’s a pic I found of this particular mount I found on google
I also got a Hero Ride kit that enables you to mount onto bars / frame, etc and this too works very well. The number of ways you can mount the Hero is mind boggling and I’m looking forward to trying out all the other methods once the weather cheers up and the trails dry out a bit (no vid is gonna look good with mud stuck to the camera!)