In the video, a person is seen writing on a whiteboard with a red marker. The person is drawing a diagram of the human body, specifically focusing on the circulatory system. The diagram includes the heart, arteries, and veins, with labels indicating the different parts. The person is using the red marker to point out specific areas of the diagram, possibly to explain or emphasize certain aspects of the circulatory system. The video does not contain any audio, so it is unclear what the person is saying or the context of the presentation. The whiteboard and the person's hand are the only visible objects in the video.