The video shows a large group of jellyfish swimming in the ocean. The jellyfish are of various sizes and colors, with some being translucent and others having a more opaque appearance. The water is a greenish-blue color, and the jellyfish are moving in different directions. In some frames, a person wearing a red swimsuit and blue fins can be seen swimming near the jellyfish. The person appears to be observing the jellyfish and swimming in a relaxed manner.