I have a Mac mini. I have a Logitech camera that I rarely plug in but have used it to Facetime on the computer. I'm taking some online music lessons where I need to send video to my instructor. I plugged in the camera, started the camera software where I get a message that another app in using the camera and it is unavailable. How do I find out what is using the camera so I can take videos? Thanks in advance for any help.