How to make a slideshow like this?

Question

3D

Subject
Interested in technology for creating similar effects, namely something like a 3D slideshow. I understand that a photo is taken, objects are cut out and placed on different layers placed at different distances from the camera. But this is a very rough description. Interested in details. More interested in the moment of preparing the photo: how to fill in the "holes" in the background, formed when cutting out objects from the near plans.

Answer 1

so photoshop