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are you asking how to get the value ? that would be:

Mat frame;
namedWindow("win");
VideoCapture cap("my.mpeg");
while( cap.isOpened() )
{
     cap >> frame;
     double millis = cap.get(CV_CAP_PROP_POS_MSEC);
     // let's draw it,
     // needs a clone, because the frame is in video-memory
     Mat draw = frame.clone(); 
     putText(draw, format("%4.3f",millis),Point(20,20), FONT_HERSHEY_PLAIN, 1.0, CV_RGB(0,255,0), 2.0);
     imshow("win", draw);
     // no imshow without waitkey..
     int k = waitKey(20);
     if ( k==27 ) break;
}

are you asking how to get the value ? that would be:or how to display it ? anyway, let's try both:

Mat frame;
namedWindow("win");
VideoCapture cap("my.mpeg");
while( cap.isOpened() )
{
     cap >> frame;
     double millis = cap.get(CV_CAP_PROP_POS_MSEC);
     // let's draw it,
     // needs a clone, because the frame is in video-memory
     Mat draw = frame.clone(); 
     putText(draw, format("%4.3f",millis),Point(20,20), FONT_HERSHEY_PLAIN, 1.0, CV_RGB(0,255,0), 2.0);
     imshow("win", draw);
     // no imshow without waitkey..
     int k = waitKey(20);
     if ( k==27 ) break;
}