The video shows a person drawing a 3D perspective view of a room on a white paper using a ruler and a pen. The person starts by drawing a horizontal line across the paper, then adds vertical lines to create the walls of the room. They then draw a doorway and a window, adding depth and perspective to the drawing. The person uses the ruler to ensure the lines are straight and precise, and the pen to draw the lines. The video is shot from a top-down perspective, showing the person's hand and the drawing process.