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A bit of quick searching says there are already head tracking mods for GTA V, but don't think anyone has tried with GTA Bike V.
I'm not actually sure why it needs a mod at all - I would have thought the head tracking input just emulates control inputs, e.g. A and D keys or controller left-right axis?
I do need to do a bit more tweaking though - as you can see from screenshots, first person view is looking too much at the road and not enough at scenery, apparently that can be fixed.
Never got round to checking it out, really should. I reckon head tracking would work really well for steering, just look where you want to go.