This is a rather sparse video representation of an American cat show. This is the bare bones of a cat show.
At first, you can see the huge facility as the show is being set up and then a judge doing his work. The cats are kept in large cages with curtains and other homely items until they are required to enter the show ring.
What you see in the second part of the video is a judge surrounded by cats in the show ring. The judge takes the cats out of smaller cages and describes them in relation to the breed standard to the small audience seated around. These are breeders and visitors.
The judge makes his decision on which cat has won that particular award and also decides lesser placings. The audience applauds. This is a time where you can learn about breed standards and what makes a good example of a particular cat breed.
You can see the judge using what I presume is an alcohol hand cleaner or some other form of hand sanitizer or hand antiseptic to stop the transmission of pathogens from one cat to another. Sometimes breeders forbid visitors touching their cats in their fancy cages before they go into the show ring to avoid transmission of zoonotic diseases.
The way this particular judge handles the cats indicates years of show cat handling. You’ll note how passive and well behaved the cats are. Sometimes a cat will do something that is not in the script. On one occasion I remember a cat escaping from his cage. He was chased around the cat show facility. He had to be caught, and fast. This was a bit undignified but it is what you’d expect of a cat.