Offline render of a camera move, used with a motion control arm. You record a move, render it, and now you can do ICVFX but with slow motion (100+fps displayed on the wall) or lots of samples / path tracing quality for your frustum.
I built a custom blueprint for it but it’s like recreating ndisplay from scratch.
This guy does it also but i’m not sure what’s his pipeline : https://www.youtube.com/watch?v=36QrWTDHBNo