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In your public Mat onCameraFrame(CvCameraViewFrame inputFrame) { }

Add following lines:

    Mat rotImage = Imgproc.getRotationMatrix2D(new Point(mRgba.cols() / 2,
            mRgba.rows() / 2), 90, 1.0);

    Imgproc.warpAffine(mRgba, mRgba, rotImage, mRgba.size());

    Imgproc.warpAffine(mGray, mGray, rotImage, mRgba.size());

Then set your activity to portrait in manifest