The video shows a close-up of a person's hand holding a black marker and coloring in a diagram of a muscle cell. The diagram is detailed, with labeled parts such as the plasma membrane, perinuclear space, myofilaments, and endomysium. The person colors in the different parts of the cell with care and precision, using a combination of black and red markers. The video is shot from an overhead angle, focusing on the diagram and the person's hand movements.