The video shows a person decorating a cake. The person is using a piping bag to apply a white cream on the top of the cake. After that, the person spreads a yellow cream on top of the white cream. Then, the person puts another layer of cake on top of the yellow cream. The person repeats the process of applying the white cream and the yellow cream on top of the cake. Finally, the person puts another layer of cake on top of the yellow cream.