In the video, a person is using a paintbrush to paint a heart-shaped mold with green paint. The mold is made of plastic and has several heart-shaped cavities. The person is carefully painting each cavity with the brush, making sure to cover all areas evenly. The green paint appears to be a vibrant shade, and the brush strokes are smooth and precise. The person's hand is steady as they work on the mold, indicating that they are experienced in this task. The background is a plain white surface, which contrasts with the green paint and makes the heart shapes stand out.