In the video, a person is seen assembling a computer. The person starts by placing a black computer case on a table. Then, they open the case and remove the side panel. The person proceeds to install a motherboard into the case, followed by a CPU and RAM. They also install a power supply and a cooling system. The person carefully places each component into the case, ensuring that everything is securely attached. The video ends with the person closing the side panel of the case.