In the video, a person is seen decorating a cake with blue frosting. The cake is already covered in white frosting, and the person is using a piping bag to apply the blue frosting in a circular motion. The blue frosting appears to be thick and creamy, and the person is carefully applying it to create a smooth and even layer. The cake is placed on a white plate, and the background is blurred, focusing the viewer's attention on the cake decorating process. The person's movements are precise and deliberate, indicating a level of skill and attention to detail in cake decorating.