The video shows a close-up of a person's fingernail being painted with black nail polish. The person uses a brush to apply the polish, starting from the base of the nail and moving towards the tip. The nail polish is glossy and appears to be of a high-quality brand. The person's nail is long and well-manicured, and the application is done with precision and care. The background is blurred, but it appears to be a neutral-colored surface.