Could you activate your camera for video call?

In Java, third-party libraries are usually used for working with the camera, as the standard API does not provide direct access to video capture devices. For example, the OpenCV library with a Java wrapper (JavaCV) can be used for capturing video from the camera.

A simple example of capturing video from a camera using OpenCV:

import org.opencv.core.Core;
import org.opencv.videoio.VideoCapture;

public class CameraCapture {
    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        VideoCapture camera = new VideoCapture(0); // 0 - first camera

        if(!camera.isOpened()) {
            System.out.println("Error opening camera");
            return;
        }

        // Here, you can implement a loop to capture frames and process them

        camera.release();
    }
}

For video communication, specialized protocols and libraries (such as WebRTC) are usually used, which integrate with Java via JNI or separate services.