Making Player Movement a Function of Head Set Position

I am working with the Oculus Rift, trying to make a game where the player moves solely based on the movement of the head set. I've gotten the player to move at a constant speed in the direction the head set is facing by using the rotation of the 'CenterEyeAnchor' as compared to the initial rotation of the 'CenterEyeAnchor'.

Now I would like the speed to depend on how far the person is moving their head (if they are leaning a lot I want the speed to be fast while if they don't move their...

Making Player Movement a Function of Head Set Position