It's very possible. But if you look in the UR corner of the frame of the first video at about 0:40 you can briefly see a camera (on a boom?) wander into the picture.

Watching the final video, you can see how much editing and film-cutting goes into putting together a live-action sequence like this. You realize several cameras were probably running, and it probably took all day and hours of film, just for a few seconds of action.
And we have become so accustomed to this that it fits together seamlessly, without us even seeing the individual skill and collective coordination that goes into it.

I believe movies are an art form that rivals anything they had in Ancient Greece or the Renaissance.

It involves the collaboration of artists, technicians, and businessmen working together.

Sure, a lot of it is crap, but 90% of everything is crap.