Yes, but you've got to pay a pretty penny for the good ones! The cheapo ones don't work worth beans and break fast / the sound quality blows from what I understand. The good ones are going to run you $150 +.
Cool!! I read about this recently and Rear view camera is very nice.
I do have spare backup camera (camera bolt on license plate) and thought of hacking and rigging it back of my helmet (that's the easy part) and figure out how to get a eyeglasses monitor that would accept RCA jack (just video input) so I can ride motorcycle without glancing at mirrors.