In the video, a person is seen using their finger to apply a substance to a wooden surface. The substance appears to be a liquid, possibly a type of polish or sealant, which is being spread along the grain of the wood. The person's finger moves back and forth, ensuring that the substance is evenly distributed across the surface. The wooden surface has a natural, warm tone, and the substance being applied has a glossy finish, indicating that it may be designed to enhance the wood's appearance. The person's movements are deliberate and careful, suggesting that they are experienced in this type of work.