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Instead of modifying the source file you can also use the setCameraIndex() function in the CameraBridgeViewBase.

 mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.fd_activity_surface_view);
 mOpenCvCameraView.setCameraIndex(1);
 mOpenCvCameraView.setCvCameraViewListener(this);

Default camera index is -1. But before setting the front camera check whether front camera is available or not.