Ionic App - Add audio to a video file

I just started developing with Ionic and am currently trying to make an app with multimedia content.

I want to add sound effects to an audio recorded by the device (client side) The next step is to add the resulting audio to a video.

I have two options:

• Merge the two audios into one - PREFERED
• Make play of the two synchronized;

I've done some research but I could not find the right solution for what I'm looking for ..

Any suggestions? Thanks

cli packages:

@ionic/cli-utils  : 1.18.0
ionic (Ionic CLI) : 3.18.0

Local packages:

@ionic/app-scripts : 3.1.2
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools: 26.1.1
Node : v6.11.3
npm  : 3.10.10
OS   : Windows 7