In the video, a person is seen using a heat gun to apply a sheet of vinyl to a car's rear light. The person's hand is visible as they smooth out the vinyl to ensure it adheres properly to the surface of the car. The heat gun is used to apply heat to the vinyl, which helps to melt and adhere it to the car's surface. The person's hand is shown smoothing out the vinyl to eliminate any air bubbles or wrinkles. The video provides a close-up view of the process, highlighting the precision and care taken to ensure a smooth and bubble-free application.