IPhone : Allows music playback during recording video like snapchat

First I want to discuss the scenario happening in snapchat.

In snapchat when you start recording video and song is running in background; It allows continue that song while recording video and after you record that video you can also able to hear that song in background.

I am using SCRecorder for recording video and capture image with my custom layout . Now in that I want to do just like above scenario but problem is whenever I start recording the video in background song is stopped playing.

SCRecorder is using AVCaptureSession for recording video.

So how can I resolve this two problem:

1. Allow background music whiile recording in video using SCRecorder.


2. Record song that is playing in background in video .