In the video, a man is seen writing on a whiteboard with a black marker. He starts by writing a series of numbers and then proceeds to draw a diagram. The man appears to be explaining something, possibly related to the diagram he is drawing. The whiteboard is positioned in a room with a dark background, and the man is wearing a white shirt. The video is shot from a side angle, focusing on the man's hand movements as he writes and draws on the whiteboard.