In the video, a person is seen drawing a graph on a whiteboard with a black marker. The graph has a sharp peak and a flat line. The person then writes "QRS" at the top of the peak and "T wave" at the bottom of the flat line. The person's hand is visible in the video, and they are wearing a red nail polish. The video is shot from a close-up angle, focusing on the whiteboard and the person's hand.