In the video, a person is seen assembling a Lego structure. The person starts by placing a Lego piece on a base and then proceeds to attach another piece on top of it. The person continues to add more pieces to the structure, carefully aligning each piece to ensure that it fits properly. The Lego pieces are of various shapes and sizes, and the person uses their hands to manipulate and connect them together. The final structure appears to be a small Lego model, possibly a vehicle or a building. The person's movements are precise and deliberate, indicating that they are experienced in building with Lego.