The first time the Zoom app opens on your iPad you will be prompted to “Allow Access” to the microphone and camera. The default camera and microphone for the Zoom app are the built in microphone and FaceTime camera.
Do USB mics work on iPad?
https://www.youtube.com/watch?v=H8iOpANuM08
Can you connect an external microphone to an iPad?
You can either use a plug-n-play iOS compatible microphone that directly plugs into your iPad or iPhone with a lightning to USB cable. Connect the external USB microphone to one of the available ports on the hub using the same USB cable that you were previously using to connect the mic to the desktop computer.Oct 6, 2014