In the video, a person is seen placing a tray of food into an oven. The tray is filled with a mixture that appears to be a casserole or baked dish, topped with a crumbly topping. The person carefully slides the tray into the oven, ensuring that it is centered and properly placed. The oven is then closed, and the food is presumably cooked. The video does not provide any further information about the contents of the tray or the type of oven used.