In the video, a person is painting their fingernail with a brown color. They start by painting the entire nail with the brown color, then they use a thin brush to paint a white line in the middle of the nail. After that, they use a black color to paint two lines on the white line, creating a design. The person then adds two more lines on the sides of the white line, completing the design. The video is shot in a close-up view, focusing on the person's fingernail as they paint it.