In the video, a person is seen using a caulking gun to apply a white substance, likely caulk, onto a wooden surface. The person is wearing a gray shirt and is standing in front of a table with a blue tape measure on it. The wooden surface appears to be a piece of plywood or a similar material. The person is applying the caulk in a straight line along the edge of the wood, ensuring that it is evenly distributed. The caulking gun is held with a steady hand, and the caulk is applied with precision. The video provides a clear view of the process, allowing viewers to see the technique used to apply the caulk.