In the video, a person is seen assembling a toy train using building blocks. The train is primarily blue, with some black and white blocks used for detailing. The person's hands are visible as they carefully place each block into its designated spot, ensuring that the train is assembled correctly. The blocks are of various shapes and sizes, and the person takes great care to align them properly. The video provides a close-up view of the assembly process, allowing viewers to see the intricate details of the toy train as it takes shape.