In the video, a person is pouring milk into a cup of coffee to create a latte art design. The person starts by pouring the milk in a circular motion, creating a base for the design. Then, they continue to pour the milk in a specific pattern, creating a series of concentric circles that resemble a flower or a rosette. The person's hand is steady, and the milk is poured with precision, resulting in a beautiful and intricate design on the surface of the coffee. The video captures the entire process, from the initial pour to the final design, showcasing the skill and artistry involved in creating latte art.