Webrtc-for-Android | Native Webrtc Android app | Security Testing library

I am using this library: https://bintray.com/google/webrtc/google-webrtc

What I want to achieve (at least, at the beginning of my project) is render video locally. I am using this tutorial (which is the only one around the Internet) https://vivekc.xyz/getting-started-with-webrtc-for-android-daab1e268ff4. Unfortunately, the last line of code is not up-to-date anymore. The constructor needs a callback which I have no idea how to implement:

localVideoTrack.addRenderer(new VideoRenderer(i420Frame -> { // no idea what to put here }));

My code is exactly the same as in the posted tutorial. This is the very first step to make familiar with WebRTC technology in Android which I cannot figure out. My camera is capturing the video because I can see it in my log:

I/org.webrtc.Logging: CameraStatistics: Camera fps: 28.

The main issue is that I have no idea how to pass it to my SurfaceViewRenderer through a callback. Did anyone meet that problem? I'll really appreciate any help or suggestions.

Here is the official example app which is the only source but it is done differently than one in the tutorial, it's much more complicated: https://webrtc.googlesource.com/src/+/master/examples/androidapp/src/org/appspot/apprtc