In the video, a man is seen putting a plastic bag over a fish tank. He then proceeds to pour water into the bag, filling it up. Once the bag is full, he ties it off and picks up a strainer. He then pours the water from the bag into the strainer, allowing the water to drain out while keeping the fish inside. The man repeats this process several times, each time filling the bag with water and straining it out. The video ends with the man holding the strainer, which is now filled with water and fish.