In the video, a person is seen working on a mechanical device. The device appears to be a large metal object with a circular opening in the center. The person is using a tool to measure the diameter of the opening, and then proceeds to place a smaller metal object inside the opening. The smaller object has a similar circular shape and appears to be a component of the larger device. The person then adjusts the smaller object to ensure it fits properly inside the opening. The video provides a close-up view of the person's hands and the mechanical device, allowing the viewer to see the details of the components and the actions being performed.