In the video, a person is using a rolling pin to crush a substance inside a plastic bag. The substance appears to be a type of grain or food item. The person is rolling the pin back and forth over the contents of the bag, applying pressure to crush the substance further. The rolling pin is made of wood and has a cylindrical shape. The plastic bag is clear and appears to be a standard zip-lock bag. The substance inside the bag is light brown in color and has a crumbly texture. The person's hands are visible as they hold the bag in place while rolling the pin over it.