In the video, a person is seen painting a wall with blue paint using a paintbrush. The person starts by painting a long horizontal line across the wall, then proceeds to fill in the area around the line with more blue paint, creating a rectangular shape. The person continues to paint around the rectangular shape, adding more details and texture to the wall. The video captures the process of the person painting the wall, showcasing the transformation of the plain wall into a vibrant blue piece of art.