In the video, a person is seen holding a knife and cutting a white onion on a black countertop. The person starts by cutting the onion in half and then proceeds to slice it into smaller pieces. The knife used is a large chef's knife with a silver blade and a black handle. The onion is cut into even slices, and the person's hands are visible throughout the video. The background is a plain black countertop, and there are no other objects or people in the frame.