Fender Top Mounted Turn Signal Cameras

Random thought occurred to me that it might be possible to mount a small backup camera inside the housing of some of the factory option turn signal indicators that mount on the top of the fender. If so these could be used as wide angle mirrors when connected to a split screen monitor inside the car. I have added a passenger mirror to my car but they're not very good at showing much of what's behind you. Would love to know if this has been done before