...for my Prius (where the posts supporting the roof are rather thick to include side-impact airbags) is flatscreens that let me effectively see through those posts; making them seem invisible would be far too difficult, but even a slightly distorted image would be valuable for preventing blind spots.
The video over RF is a good idea as long as there’s enough information for the heads-up display on your car to put the image in the right place on the windshield. I wouldn’t want people taking their eyes off the road to look at a screen in the dashboard to do that.