The video shows a person using a tool to adjust the tension of a belt on a car engine. The person is seen using the tool to make adjustments to the belt, which is located under the hood of the car. The belt is black and appears to be made of rubber. The person's hand is visible as they manipulate the tool, and the engine components can be seen in the background. The video does not provide any additional context or information about the location or purpose of the adjustment.