How to feed raw Camera feeds into Android Meeting SDK

Meeting SDK Type and Version
Android Meeting SDK v6.1.0

Description
Can somebody tell me how I can utilise ZoomSDK.getInstance().getVideoSourceHelper().setExternalVideoSource() to take raw data from Camera (which is an external usb/IP Camera), and feed into it.

Is there any code sample or clear documentation on how to use these SDK methods to send arbitrary frame (of bitmap/image/color, or external camera feeds)?