In the video, a person is using a red and black caulking gun to apply white caulk around a black metal vent on a wall. The wall is gray with patches of white and gray paint. The person is wearing a white shirt and is standing in front of the wall. The caulking gun is being used to apply the caulk around the vent, which is located in the center of the wall. The person is moving the caulking gun in a circular motion to ensure that the caulk is applied evenly around the vent.