In the video, a person is seen using a piping bag to apply chocolate frosting onto a cake. The cake is already decorated with yellow and black frosting, and the person is adding chocolate frosting to create a design. The piping bag is squeezing out a thin line of chocolate frosting, and the person is carefully placing the frosting on the cake to form a pattern. The video is shot from a close-up angle, focusing on the cake and the person's hand. The person's hand is steady, and they seem to be experienced in cake decorating. The chocolate frosting is a rich, dark brown color, contrasting with the bright yellow and black frosting already on the cake. The video does not show the entire cake, but it is clear that the person is adding to an existing design.