In the video, a person is seen cutting a red onion on a wooden cutting board. The person is using a large knife to chop the onion into thin slices. The onion is already partially cut, and the person continues to slice it into smaller pieces. The cutting board is placed on a kitchen counter, and the person's hands are visible as they hold the onion and knife. The video focuses on the action of cutting the onion, with the sound of the knife slicing through the onion being audible.