In the video, a person is holding a phone in their hand and demonstrating how to attach a clear plastic case to it. The person first shows the phone with the case already attached to the back. Then, they proceed to attach the case to the front of the phone, carefully aligning it with the screen. The person then shows how the case fits snugly around the edges of the phone, providing protection for the device. Throughout the video, the person's movements are deliberate and precise, ensuring that the case is properly attached and the phone is not damaged.