This has existed for TV news cameras for a long time: https://en.wikipedia.org/wiki/Teleprompter#/media/File:Teleprompter_schematic.svg https://en.wikipedia.org

This has existed for TV news cameras for a long time: https://en.wikipedia.org/wiki/Teleprompter#/media/File:Teleprompter_schematic.svg https://en.wikipedia.org/wiki/Teleprompter#/media/File:Telep... The trick is to put the camera behind a one-way mirror and project onto the other side.