In the video, a person is seen drawing a diagram on a whiteboard using a blue pen. The diagram appears to be a mechanical drawing of a machine or device, with various parts and components. The person's hand is visible as they draw, and they seem to be explaining the diagram as they go. The whiteboard is clean and clear, with no other markings or text visible. The person's movements are deliberate and precise, indicating that they are experienced in drawing such diagrams. The video does not provide any audio or additional context, so it is difficult to determine the exact purpose or function of the diagram. However, it is clear that the person is skilled in their craft and takes care to ensure that the diagram is accurate and detailed.