The video shows a person swimming in a pool while wearing a mermaid costume. The costume is green and red in color, with the green part resembling a tail and the red part resembling a top. The person is swimming gracefully, moving their arms and legs in a way that mimics the movements of a mermaid. The water in the pool is clear and blue, and bubbles can be seen around the person as they swim. The person appears to be enjoying themselves, and the video captures the playful and imaginative nature of the costume.