In the video, a person is seen assembling a computer case. The person is holding a black plastic piece with a mesh-like pattern on the top and bottom. They are carefully placing it into the side of the black computer case, which is already open and has various other components inside. The person's hands are visible, and they seem to be wearing a white shirt. The computer case is placed on a white surface, and there is a black chair visible in the background. The person's actions are deliberate and precise as they ensure that the plastic piece fits perfectly into the case.