The video shows a group of people constructing a sandcastle made of Rice Krispies. They are using a pink icing to decorate the castle. The castle is quite large and has a mermaid tail on the front. The people are carefully placing the icing on the castle to ensure it looks neat. The castle is made of several layers of Rice Krispies, and the icing is being applied to the top layer. The video captures the process of the castle being built and decorated.