Spectator camera mods?

Are there any mods to adjust the camera in spectator mode? I’d like to turn it 90 degrees so I can do a pseudo mixed reality in post production. Like I would record the spectator footage 90 degrees to the player character. Then in real life I would record roughly the same position of myself playing the game on a green screen. Then afterwards I would put the two together in After Effects and do the arduous job of roto scoping the hands. Id rather do this than stress my computer with mix reality.