In the video, a person is seen decorating a cake with blue fondant. The cake is hexagonal in shape and has white frosting on it. The person is using a blue fondant sheet to cover the top of the cake. They are carefully smoothing out the fondant to ensure it fits perfectly on the cake. The person's hands are visible in the video, and they are using a tool to press down on the fondant to create a smooth surface. The cake is placed on a table, and the background is blurred, focusing the viewer's attention on the cake decorating process.