In the video, a person is seen demonstrating how to use a canning jar lid. The person is holding a canning jar lid in one hand and a canning jar in the other hand. The person then places the lid on top of the jar and pushes down on the center of the lid to create a seal. The person then rotates the lid to the side to show how it can be opened. The person repeats this process several times, showing how to seal and open the canning jar lid.