In the video, a person is building a wooden structure in a game. The person is placing wooden logs on the ground to create a base for the structure. They then proceed to add more logs on top of each other to form a vertical pillar. The person continues to build the structure by adding more logs to create a horizontal platform. The structure appears to be a simple wooden platform or base for a larger construction. The person is using a cursor to place the logs, and the game interface is visible with various building materials available for selection.