select_back_camera.js

async function selectLastCamera() {
  const devices = await navigator.mediaDevices.enumerateDevices();
  const videoDevices = devices.filter(device => device.kind === 'videoinput');
  
  if(videoDevices.length > 0) {
    const lastDeviceId = videoDevices[videoDevices.length - 1].deviceId;
    const constraints = {
      video: { deviceId: { exact: lastDeviceId } }
    };

    try {
      const stream = await navigator.mediaDevices.getUserMedia(constraints);
      // Use the stream for your video element
      video_source.srcObject = stream;
      video_source.play();
    } catch(error) {
      console.error('Error accessing the camera', error);
    }
  }
}

selectLastCamera();