In the video, a man is seen sitting in a chair with a whiteboard in front of him. He is holding a marker in his hand and writing on the board. The man is wearing a brown sweater and a watch on his left wrist. He is speaking to the camera while writing on the board. The whiteboard has several mathematical equations written on it. The man appears to be explaining the equations as he writes them down. The room in which the man is sitting is not visible in the video.