In the video, a person is seen using a plastic bottle to separate an egg yolk from the white. The person is holding the bottle upside down and carefully placing the opening of the bottle over the yolk in the bowl. They then gently squeeze the bottle, allowing the yolk to pass through the opening and into the bowl while the white remains in the bowl. The person repeats this process until all the yolks are separated from the whites. The video is a demonstration of a simple and effective method for separating egg yolks without the need for additional tools or ingredients.