How are the opening shots of some Hollywood blockbusters shot?

If it's made by computer, the cost is too high. The domestic film-grade CG is about 1w/s.

There are two ways to stabilize the picture:

1. Stabilizer, which may have been seen in the film of the film festival, is a round frame with a camera hanging in the middle, which can basically keep the picture still (you can search for Steadicam on the Internet)

2.