In the video, a person is seen working on a machine. The person is holding a metal object and is seen rotating it. The metal object appears to be a part of a larger machine. The person then proceeds to attach another metal object to the first one. The second metal object has a circular shape with teeth on its outer edge. The person then rotates the second metal object, which is now attached to the first one. The video does not provide any information about the purpose of the machine or the objects being worked on.