The video shows a close-up of a person's hand using a piping bag to decorate a cake. The cake is pink in color and has a smooth, flat surface. The person is using a metal tip on the piping bag to create a ruffled pattern around the edge of the cake. The ruffles are evenly spaced and have a consistent shape and size. The person's hand moves steadily as they pipe the ruffles, and the cake appears to be on a rotating stand to make the process easier.