In the video, a person is seen holding a clear plastic cup in one hand and a blue slime in the other. The person then proceeds to pour the blue slime into the cup, followed by a green slime. The person continues to pour the slime into the cup until it is full. The person then shakes the cup, causing the slime to mix together and create a new color. The person then removes the cup from the frame, revealing the mixed slime.