public void changeCameraParameters(CameraParametersCallback callback) {
        if (cameraInstance != null) {
            cameraInstance.changeCameraParameters(callback);
        }
    }
Changes the settings for Camera.
Must be called after {@link #resume()}.

@param callback {@link CameraParametersCallback}
zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java