In the video, a person is seen applying caulk to a wooden beam. The beam is positioned vertically and is made of light-colored wood. The person is using a caulking gun, which has a yellow nozzle, to apply the caulk. The caulk is being applied along the seam where the beam meets a concrete wall. The person's hand is visible, holding the caulking gun, and they are applying the caulk with precision. The caulk is white and contrasts with the light color of the wood and the gray color of the concrete wall. The video focuses on the application of the caulk and does not show any other part of the construction site.