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I have found the answer that worked for me, so I'm sharing it with the community:

You can set your preview (in this case a CameraBridgeViewBase) transparent by setting the alpha value of the view, with 0 being completely invisible.

mOpenCvCameraView.setAlpha(0);

This should make your preview "disappear".

I have also posted it to above linked thread on a StackOverflow forum.