Is that true? Seems dubious to me. The scale in time, velocity, and space is below where relativity becomes visible beyond Planck level scales that certainly don’t show up in a video clip.

It might be enough to deduce Newtonian motion if you have a lot of the required priors already.

A lot of telescope data over time combined with a strong math model and a lot of other priors is probably enough to get relativity. You have to be able to see things like planetary motion and that the results don’t match Newton exactly, and then you need enough data to fit to a different model. You probably also need to know a lot about the behavior of light.