The video shows a close-up of a bicycle's chain. The chain is made up of metal links and is attached to the gears of the bike. The gears are also made of metal and are part of the bike's drivetrain system. The chain moves smoothly over the gears, indicating that the bike is in good working condition. The bike appears to be parked on a dirt ground, and there is a fence visible in the background. The video does not show any people or animals, and there is no sound other than the chain moving.