Add barcode tracking

[xulihang]

Do you want to request a feature or report a bug?

Feature.

What is the current behavior?

If the current behavior is a bug, please provide the steps to reproduce.

Please mention other relevant information such as the browser version, Operating System and Device Name

What is the expected behavior?

If this is a feature request, what is motivation or use case for changing the behavior?

I would like to track barcodes. Is it possible to add barcode tracking based on libraries like zxing-js?

[EncryptEx]

like this ? https://stemkoski.github.io/AR.js-examples/follower.html https://github.com/stemkoski/AR.js-examples/blob/master/follower.html