Welcome,
This is unlikely to work, because PocketsphinxController has very specific audio session requirements which won’t have much in common with that of AVCaptureSession, and if PocketsphinxController isn’t overriding the mic that AVCaptureSession needs it is likely to be the opposite case in which AVCaptureSession is overriding the mic that PocketsphinxController needs, and or the mic being available to both but with the wrong characteristics (for instance, sample rate, mono v stereo, etc). But, you can give it a try by setting PocketsphinxController’s audioSessionMixing to TRUE and see if that helps.