In the video, a man is demonstrating how to use a kitchen gadget. He places a clear glass jar on a countertop and then attaches a white and green gadget to the top of the jar. He then proceeds to insert a cucumber into the gadget, which is designed to cut the cucumber into slices. The man then removes the sliced cucumber from the jar, revealing the gadget's functionality. The video focuses on the ease of use of the gadget and its ability to slice vegetables quickly and efficiently.