How to access mobile back camera

Questions
1

Hi I am working on to create custom AR experience on babylon without webxr, for that I need to access back camera of mobile but could not find any doc about it. Please help

2

This is more HTML5 question. Here is the very good article with example how to do it with the help of Javascript - How To Access Front and Rear Cameras with JavaScript's getUserMedia() | DigitalOcean

3

get usermedia i am able to do with it, but i want in babylon so i can use my custom AR features rendered .
Or if you could help me use the input from getusermedia converted to stream usable in babylon that will also be helpful

4

Here is one of the numerous examples - Babylon.js Playground, another - https://playground.babylonjs.com/#1P9EED#3
Using the API method CreateFromWebCam - VideoTexture | Babylon.js Documentation - you can add in constraints for back mobile camera something like
{ audio: true, video: { facingMode: { exact: "environment" } } }
as described here - MediaDevices.getUserMedia() - Web APIs | MDN

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