We have electron microscopes. As long as you have time (which when you’re recording actors doing a scene, you don’t) we have the tech to look at things at any scale we want.
We wouldn’t even need AI, just a way to illuminate the film and some optics to project it at whatever scale we need onto a sensor, and we could scan every frame on a film down to the molecular level if we wanted.
Compositing the resulting scan data into digital video would be trivial, and the resulting file would have a level of quality higher than what any digital sensor could have recorded directly.