Using Webcam Capture project.
Example from author for the API usage:
Webcam buildin = Webcam.getWebcams().get(0); // build-in laptop camera
Webcam usb = Webcam.getWebcams().get(1); // usb camera
BufferedImage image1 = buildin.getImage();
BufferedImage image2 = usb.getImage(); // do with image1 and image2 whatever you want
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solved Using the camera of the laptop with swing in java [closed]