In the video, a person is seen installing a power supply unit into a computer case. The person's hands are visible, and they are carefully placing the power supply unit into the case. The power supply unit is black and has a label on it that reads "Seasonic". The person's hands are steady as they ensure that the power supply unit is properly aligned and securely placed in the case. The video provides a close-up view of the installation process, allowing viewers to see the details of the power supply unit and the interior of the computer case.