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here's some basic code to get you started, for anything else, please refer to java docs / tutorials (e.g., adding a menu is quite offtopic here..)

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.*;
import org.opencv.imgproc.*;

import java.awt.*;
import java.awt.image.*;
import java.lang.Thread.*;
import javax.swing.JFrame;

// helper class to override Panel's paint():
class ShowImage extends Panel {
    BufferedImage  image;

    public BufferedImage Mat2BufferedImage(Mat m) {
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if (m.channels() > 1) {
            type = BufferedImage.TYPE_3BYTE_BGR;
        }
        // copy pixels from Mat to BufferedImage:
        int bufferSize = m.channels()*m.cols()*m.rows();
        byte [] b = new byte[bufferSize];
        m.get(0,0,b);
        BufferedImage image = new BufferedImage(m.cols(),m.rows(), type);
        final byte[] targetPixels = ((DataBufferByte)image.getRaster().getDataBuffer()).getData();
        System.arraycopy(b, 0, targetPixels, 0, b.length);
        return image;
    }
    public void show(Mat m) {
        image = Mat2BufferedImage(m);
        repaint();
    }
    public void paint(Graphics g) {
        g.drawImage(image, 0, 0, null);
    }
}

public class SimpleSample {
    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Display image");
        frame.setSize(640, 480);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        ShowImage imshow = new ShowImage();
        frame.getContentPane().add(imshow);

        VideoCapture cap = new VideoCapture(0);    
        while (cap.isOpened()) {
            Mat im = new Mat();
            if (! cap.read(im))
                break;
            imshow.show(im);
            try { Thread.sleep(20); }
            catch(Exception x) {}
        }
    }
}

here's some basic code to get you started, for anything else, please refer to java docs / tutorials (e.g., adding a menu is quite offtopic here..)

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.*;
import org.opencv.imgproc.*;

import java.awt.*;
import java.awt.image.*;
import java.lang.Thread.*;
import javax.swing.JFrame;

// helper class to override Panel's paint():
class ShowImage extends Panel {
    BufferedImage  image;

    public BufferedImage Mat2BufferedImage(Mat mat2Buffer(Mat m) {
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if (m.channels() > 1) {
            type = BufferedImage.TYPE_3BYTE_BGR;
        }
        BufferedImage image = new BufferedImage(m.cols(), m.rows(), type);
        // copy pixels from Mat to BufferedImage:
        int bufferSize = m.channels()*m.cols()*m.rows();
m.channels() * m.cols() * m.rows();
        byte [] b = new byte[bufferSize];
        m.get(0,0,b);
        BufferedImage image = new BufferedImage(m.cols(),m.rows(), type);
        final byte[] targetPixels pixels = ((DataBufferByte)image.getRaster().getDataBuffer()).getData();
        System.arraycopy(b, 0, targetPixels, pixels, 0, b.length);
        return image;
    }
    public void show(Mat m) {
        image = Mat2BufferedImage(m);
mat2Buffer(m);
        repaint();
    }
    public void paint(Graphics g) {
        g.drawImage(image, 0, 0, null);
    }
}

public class SimpleSample {
    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Display image");
        frame.setSize(640, 480);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        ShowImage imshow = new ShowImage();
        frame.getContentPane().add(imshow);

        VideoCapture cap = new VideoCapture(0);    
        while (cap.isOpened()) {
            Mat im = new Mat();
            if (! cap.read(im))
                break;
            imshow.show(im);
            try { Thread.sleep(20); }
            catch(Exception x) {}
        }
    }
}

here's some basic code to get you started, for anything else, please refer to java docs / tutorials (e.g., adding a menu is quite offtopic here..)

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.*;
import org.opencv.imgproc.*;

import java.awt.*;
import java.awt.image.*;
import java.lang.Thread.*;
import javax.swing.JFrame;

// helper class to override Panel's paint():
class ShowImage extends Panel {
    BufferedImage  image;

    public BufferedImage mat2Buffer(Mat m) {
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if (m.channels() > 1) {
            type = BufferedImage.TYPE_3BYTE_BGR;
        }
        BufferedImage image = new BufferedImage(m.cols(), m.rows(), type);
        // copy pixels from Mat to BufferedImage:
        int bufferSize = m.channels() * m.cols() * m.rows();
        byte [] b = new byte[bufferSize];
        m.get(0,0,b);
        final byte[] pixels = ((DataBufferByte)image.getRaster().getDataBuffer()).getData();
        System.arraycopy(b, 0, pixels, 0, b.length);
        return image;
    }
    public void show(Mat m) {
        image = mat2Buffer(m);
        repaint();
    }
    public void paint(Graphics g) {
        g.drawImage(image, 0, 0, null);
    }
}

public class SimpleSample {
    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Display image");
        frame.setSize(640, 480);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        ShowImage imshow = new ShowImage();
        frame.getContentPane().add(imshow);

        VideoCapture cap = new VideoCapture(0);    
        while (cap.isOpened()) {
            Mat im = new Mat();
            if (! cap.read(im))
                break;
            imshow.show(im);
            try { Thread.sleep(20); }
            catch(Exception x) {}
        }
    }
}