Fallout NV has full 6DOF tracking. For the best possible head tracking please make sure to run the DirectVR scanner after entering the game world. You should see an according hint in the top left corner of the game window as well as in the headset.
Controller: VR controllers can be used as gamepad or to emulate mouse/kb, configurable in the vorpX menu (presslong DEL opens the menu).
If you haven’t done so already, you may also want check the ‘Essential Hints Guide’ in the vorpX help. It explains a few basic concepts.