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There's an example on how to create swing GUI with Java OpenCV. The full source is available here: https://github.com/JavaOpenCVBook/code/tree/master/chapter2/opencv-gui You can compile and run it in a couple minutes using maven and the information here: https://github.com/JavaOpenCVBook/code

You would basically have to put a JSlider to your JFrame, and the code there would be something like this:

    private void setupSlider(JFrame frame) {
    JLabel sliderLabel = new JLabel("Blur level", JLabel.CENTER);
    sliderLabel.setAlignmentX(Component.CENTER_ALIGNMENT);

    int minimum = 0;
    int maximum = 10;
    int initial =0;

    JSlider levelSlider = new JSlider(JSlider.HORIZONTAL,
            minimum, maximum, initial);

    levelSlider.setMajorTickSpacing(2);
    levelSlider.setMinorTickSpacing(1);
    levelSlider.setPaintTicks(true);
    levelSlider.setPaintLabels(true);
    levelSlider.addChangeListener(new ChangeListener() {

        public void stateChanged(ChangeEvent e) {
            JSlider source = (JSlider)e.getSource();
            int level = (int)source.getValue();
            Mat output = imageProcessor.blur(image, level);
            updateView(output);         
        }
    });

    frame.add(sliderLabel);
    frame.add(levelSlider);
}