Intel INDE - video capture for Unity 3D (how to capture only video and audio applications instead of using a microphone)

Question

Good afternoon!

I followed the instructions at this link: Intel® INDE for Mobile Tutorials - Video Capture for Unity3d * Android Application * , and I did it with my application. The only problem is that the sound uses a microphone to record, and it created a lot of noise, thus creating a lower quality file. My question is, how can I just get just regular video and audio (application output)? If this is not possible, how can I integrate the audio file into the recorded video? Hope you could give some guides and examples.

Thank you in advance!