

You should be able to test the devices from here as well. In your System Preferences, you can also go to the Sound section and verify the devices in the Output and Input tabs.
HOW TO ACCESS VIDEO CAMERA AND MICROPHONE FOR IMAC HOW TO
How To Get Your Camera And Microphone Working In MacOS Mojave

As a part of the security focus in the latest macOS Mojave, Apple has added some new privacy features that require applications to request permission to access things like your camera or microphone. In previous macOS versions, any application could gain control over these devices with or without you knowing. If you’re having an issue getting your camera or microphone working in certain apps after upgrading your Mac to macOS Mojave, it could be related to some of the new security and privacy features.
