I agree with what lusche is saying.
Basically if you used Trackir, with the same program that the guy in the video is using, it would do the exact same thing.
Using the standard Trackir Pro 4.
I don't wear a hat, i clip the trackir clip to the top of my headphones.
When i want to use speakers, i clip it onto the top of the old style metal frame headphones that i had laying around. I ripped out the actual speakers and bent the metal to fit my skull.
You could probably use one of those upside down "U" things that girls use to hold back there hair, and just clip it onto the top of that to.