I never said to ignore a rule, but I see where you got that impression.
Because of that the legacy rule has been deleted.
You just need to need to have live action footage for you basis. What I said is that it can be a still.
There is a famous scene in Jurassic Park, where Doctor Grant is looking at the Brontosaurus for the first time. There is a part of that scene where he looks at the valley from the top of the hill and watches hundreds of dinosaurs.
All the backgrounds for that scene were done with one still camera.
You could do, for example, a flyover downtown area frozen. You just need to take photo stills to use as background plates.
-R