In the video, a person is seen holding a piece of blue slime in their hand. They then use a bottle to add a substance to the slime, causing it to expand and change shape. The person continues to manipulate the slime, stretching and squeezing it, and adding more substance from the bottle. The slime appears to be a thick, gooey material, and the person's movements are deliberate and controlled. The background is a solid color, providing a clear view of the slime and the person's actions.