I went into a car electronics place to ask if it was possible to retro-fit a side camera, as where I live I have to pull across a path, into traffic with parked cars either side, the cars are not so much of the problem but cyclists are a complete nightmare as they bomb up between the moving traffic and the parked cars, I wouldn't be able to see them until it is too late and most don't stop even when I am edging out slowly.
The car electronics owner said it wouldn't be a problem and that they would be able to display the picture on the cars MMI, operated by a switch. Everything sounded good until I asked for the price which they estimated would be £4,000, I didn't ask if that included VAT
Instead I fitted a night vision camera to the front number plate, connected to a WIFIAV that connects to my phone, works really well and cost less £50. Finding a suitable 12V supply was the only challenge. It takes about 30 seconds for me to connect to the camera's WiFI and get a picture, not too bad as it is more or less the time it takes me to start the car and put on the seat belt, but well worth it as I am convinced it has saved the lives of a few cyclists.
I have the same problem with parking in a tight garage, having researched the problem looking for solutions there are overhead laser beam systems that allow you to line up to a part on the car to ensure that you are lined up right, or some low tech solutions such as tyre guides on the floor, or a mirror located on the wall. I am fairly okay lining it up and actually find parking it at at a slight angle gives me more room opening the door, but I do have a bit of wood laid across the floor to prevent the car going back too far. I have a reversing camera but it isn't perfect when the garage space is so tight and all the parking senors are well out of their comfort zone.
A side camera with a radar and audio warning would be the perfect solution should any Chinese manufacturer be reading this.
Martin