I wonder, mimic a window by putting a 4K inserted into the wall cavity so it is flush, add curtains, and then use a 4K can to shoot the live view you would see

I wonder, mimic a window by putting a 4K inserted into the wall cavity so it is flush, add curtains, and then use a 4K can to shoot the live view you would see through that space, show a visitor, then switch the feed - looks like magic...