In the video, a person is seen drawing on a whiteboard with a marker. The drawing consists of a series of interconnected shapes and arrows, which represent a process or system. The person is adding labels to the different parts of the drawing, which include a pump, a pressure tank, and a reservoir. The labels are written in different colors, and the person is using a marker to write them. The drawing appears to be a diagram or schematic of some sort, possibly related to plumbing or hydraulics.