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i do not have any adroid sdk, so i cannot test, but the gist is like this:

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();

        float zoom = 0.8;
        Size orig = mRgba.size();
        int offx = (1.0-zoom) * orig.width;
        int offy = (1.0-zoom) * orig.height;

        // crop the part, you want to zoom into:
        Mat cropped = mRgba.submat(offy, orig.height-2*offy, offx, orig.width-2*offx);
        // resize to original:
        Imgproc.resize(cropped, cropped, orig);

        return cropped;
}

i do not have any adroid sdk, so i cannot test, but the gist is like this:

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();

        float zoom = 0.8;
        Size orig = mRgba.size();
        int offx = 0.5 * (1.0-zoom) * orig.width;
        int offy = 0.5 * (1.0-zoom) * orig.height;

        // crop the part, you want to zoom into:
        Mat cropped = mRgba.submat(offy, orig.height-2*offy, orig.height-offy, offx, orig.width-2*offx);
orig.width-offx);
        // resize to original:
        Imgproc.resize(cropped, cropped, orig);

        return cropped;
}