I can somehow get access to the microphone in ios app?
For now, you’ll need to use a declare into the low level iOS framework or wait for a later version of the Xojo iOS framework.
Should be possible with declares. I don’t have time to translate it, but this looks like a good tutorial. You can skip the delegate and delegate methods - they aren’t required.
http://www.appcoda.com/ios-avfoundation-framework-tutorial/