In the video, a person is seen pouring chocolate batter over a tray of marshmallows. The tray is filled with rows of white marshmallows, and the chocolate batter is being poured from a metal bowl. The person uses a spatula to spread the batter evenly over the marshmallows. The chocolate batter is thick and glossy, and the marshmallows are fluffy and white. The person's movements are careful and precise, ensuring that the batter is spread evenly over the marshmallows. The video captures the process of creating a delicious dessert, with the contrast between the rich chocolate and the soft marshmallows being particularly striking.