Record audio + video conference at server side using node js + kurento media server

I want to record audio + video video conference at server side using Kurento Media server and NodeJs. I have already a sample code downloaded from Kurento documentation. Its running perfectly and but not recording the video and audio. I need only a small piece of code to record video and audio. The budget of this work is 30$. Please bid only if you can do. Im already a developer and tried but stuck in the recording part.