American film shooting seems that photographers can fly in the air. Why?

Those are generally CG, in fact, only cars, the rest are green screens and then later computer synthesis; For example, the CG technology of The Lord of the Rings was almost the limit at that time, and the director could observe the whole battlefield from any angle.

/show/d6xvbdyrn1_ 7ifj.html This video is a demonstration.

The green screen is for the convenience of matting.

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So you know the actors are in pain, haha, and they have to perform in front of the green screen and the blue screen. There is no atmosphere at all.