>>52665117There are live cameras inside the venue that use real world vision, and "virtual" cameras which output a signal feed of scenes inside the 3D rendering (this can be a single feed if it's a pre-record).
A director then (pic related) sits in an OB van showing every camera angle and will say what screen to show at any time to output to the broadcast.
If the performance is live and not a pre-record then there will be an additional director who separately controls what is being shown on the real world screens.