device.streamON();
    v4l2_buffer bufferQueue;
    while (!exit_requested){
        //capture code
        device.dequeueBuffer(&bufferQueue);
        // use the h264 buffer inside bufferPtr[bufferQueue.index]
        ...
        device.queueBuffer(bufferQueue.index, &bufferQueue);
    }
    device.streamOFF();

BroadcomVideoDecode decoder;
     while (!exit_requested) {
        //capture code start
        ...
        //decoding code
        decoder.writeH264Buffer(bufferPtr[bufferQueue.index],bufferQueue.bytesused);
        //capture code end
        ...
    }