The video shows a close-up of a bicycle's rear wheel and gear system. The person in the video is using their finger to point out different parts of the gear system. The gear system is made up of a series of metal gears and a chain that connects them together. The person's finger moves around the gear system, pointing out different parts and explaining their function. The gear system appears to be well-maintained and in good condition. The video provides a detailed look at the inner workings of a bicycle's gear system, which is essential for the bike's operation.