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For the instance you can write a function that will try to open video capture devices by enurator started from the 0:

cv::VideoCapture _videocapture;
std::vector<std::pair<int,cv::String>> v_videodevices
int _devid = 0;
while(true) {
   if(_videocapture.open(_devid)) { 
      v_devices.push_back( std::make_pair<int,cv::String>(_devid, "Device " + std::to_string(_devid)) );
      _devid++;
   } else {
      break;
   }        
}

Alternativelly you can use Qt library and QCamera class to enumerate all available video devices.

For the instance you can write a function that will try to open video capture devices by enurator started from the 0:

cv::VideoCapture _videocapture;
std::vector<std::pair<int,cv::String>> v_videodevices
int _devid = 0;
while(true) {
   if(_videocapture.open(_devid)) { 
      v_devices.push_back( std::make_pair<int,cv::String>(_devid, "Device " + std::to_string(_devid)) );
      _devid++;
   } else {
      break;
   }        
}
_videocapture.release();

Alternativelly you can use Qt library and QCamera class to enumerate all available video devices.