The video shows a close-up of a person's hand as they work on a bicycle's rear derailleur. The person's hand is holding a tool and making adjustments to the derailleur. The bicycle is upside down, and the person is working on the chain and gears. The video is shot in a well-lit room, and the person's hand movements are precise and deliberate. The bicycle appears to be a road bike with a black frame and silver gears. The person's hand is steady, and they seem to be experienced in working on bicycles.