I have an Android 6.0.1 device without camera where a single USB camera has been attached. The camera works fine in other apps on the device, but Wowza GoCoder and GoCoder SDK fails with the error
An error occured
An exception occurred during camera activation.
I found a thread (https://www.wowza.com/community/questions/7722/wzcamera-failing-on-devices-with-only-one-camera.html) from 2016 discussing problems with single camera devices, but is says that this has been solved in a new version of the SDK. I am using updated versions.
