The video shows a person's hand holding a pen and writing on a piece of paper. The person is writing numbers and letters around a diagram of a circle with lines drawn inside it. The diagram appears to be a representation of a geometric shape, possibly a circle with intersecting lines. The person is writing numbers and letters around the diagram, which could be a mathematical or scientific calculation. The paper is white, and the pen is black. The person's hand is visible, and they seem to be right-handed. The video is shot from a close-up angle, focusing on the paper and the person's hand.