The moving graph is composited on top of raw multi-camera footage, along with some other control information.
That compositing could also be done at the client for a considerable saving.
But it is your own and your clients cpu, bandwidth and time, therefore money, that you are spending. Not mine. Good luck.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.