In the video, a person is seen decorating a heart-shaped cookie with green icing. The cookie is placed on a brown surface, and the person uses a piping bag with a fine tip to apply the icing. The icing is applied in a specific pattern to create a design on the cookie. The person's hand is steady as they carefully pipe the icing onto the cookie, ensuring that the design is even and precise. The green icing contrasts beautifully with the brown surface, making the design stand out. The video captures the intricate process of cookie decoration, showcasing the skill and precision required to create such a delicate design.