In the video, a person is seen applying plaster to a wall using a trowel. The person starts by applying the plaster in a vertical motion, then switches to a horizontal motion, and finally uses the trowel to smooth out the plaster on the wall. The wall appears to be in the process of being plastered, with some areas already covered in plaster and others still bare. The person's movements are deliberate and precise, indicating experience and skill in the task. The trowel used is a flat, rectangular tool with a handle, commonly used in construction and plastering work. The plaster itself is a white, thick substance that is applied in layers to create a smooth, even surface on the wall.