Except of course for the specific technology, there is nothing new here. It is called "power scavaging". At first blush it seems to have zillions of uses, but it actually has very limited uses. Namely, it may be good for performing internal tasks within low power devices, but transmitting any information or activating an actuator will require more power than can be scavaged.
If you want a lot more power from body motion, just add a crank, generator and a super-cap/rechargable battery. I just board a nifty LED flashlight that works great after only a couple of turns of the handle.