What is the Worklight Server and Studio version that you are using?
Make sure you closely follow PhoneGap's API; try first with a minimized testcase and then incorporate it into your Worklight application.
My worklight server version : 184.108.40.2063.
I tried PhoneGap's api and make a build for ios and it work for me. But PhoneGap integrated in Worklight can't load Recorder Screen. Please see the image to know exactly prolem
The phoneGap API for captureAudio works on Worklight.