In the video, a person is seen holding a knife with a wooden handle and a silver blade. The person's thumb is placed on the blade, and they use their index finger to push the blade out of the handle. The blade is then retracted back into the handle with a push of the thumb. The person repeats this action several times, demonstrating the mechanism of the knife. The background is a wooden surface, and the lighting is bright, highlighting the details of the knife and the person's hands.