In the video, a person is seen working on a bicycle. The person is wearing a red watch on their left wrist and is using a tool to fix the chain on the bike. The bike is blue and has a red chainring. The person is seen using the tool to adjust the chain and then checks the tension of the chain by hand. The person then uses a screwdriver to adjust the tension further. The video shows the person's hands and the bike in detail, but the person's face is not visible. The background is a white door, and the floor is concrete.