For inside, any of the "extreme sports" bullet cams with attached SD card recorders. The high end of these is the
Sony HXR-MC1P
For exterior stabilised has to be Tyler sidemount with a gyrostab system like UM or Cineflex. You can only nosemount on the 44 ENG model.
But if it's just POV your after, rather than a stabilised image, you'll have to see what your local rules will allow. Bullet cam on the door frame ?