If your webcam is not showing or your webcam shows a black screen in the Zoom application, there may be a webcam cover installed on your computer that may be blocking it.

On the new HP laptops, there is a webcam cover that you are able to slide to cover/uncover your webcam.

If your webcam is covered, it will show little white and black lines indicating that it is covered.

You may simply slide the webcam cover open. It may take some time to get used to finding the "slit" to uncover the webcam.