The video shows a person decorating a cupcake with green frosting. The person is using a piping bag to apply the frosting in a circular motion, starting from the outer edge and moving towards the center of the cupcake. The cupcake is placed on a white plate with a scalloped edge. The frosting is applied in a smooth, even layer, and the person takes care to cover the entire surface of the cupcake. The green frosting contrasts nicely with the brown color of the cupcake, and the white plate provides a clean, simple background that highlights the cupcake and the decorating process.