In the video, a man is seen demonstrating how to properly install a child's car seat. He starts by placing the seat on the car's back seat and then proceeds to secure it with the seat belt. He adjusts the straps to ensure that the seat is tightly fastened and the child is secure. The man then shows how to properly adjust the headrest to provide additional support for the child's head. Throughout the video, he emphasizes the importance of ensuring that the seat is properly installed to prevent any accidents or injuries.