In the video, a man is seen standing in front of a whiteboard. He is holding a marker and pointing to a diagram on the board. The diagram consists of three curved lines that intersect at various points. The man is explaining the diagram, which appears to be a representation of three-phase electricity. He is wearing a light-colored shirt and has a watch on his left wrist. The whiteboard is clean and well-lit, and the man appears to be speaking clearly and confidently.