In the video, a man is seen using a caulking gun to apply a yellow substance to the edges of a large white block. The block is made of styrofoam and has a hollow center. The man is wearing a white shirt and sunglasses, and he is carefully applying the substance to ensure that it fills the gaps between the block and the edges. The background is a construction site with other blocks and tools visible. The man's movements are precise, and he takes care to ensure that the substance is applied evenly. The video provides a close-up view of the process, allowing the viewer to see the texture of the styrofoam and the consistency of the yellow substance.