message: Fix video_capture example as per
diff: @@ -24,7 +24,8 @@ fn run() -> opencv::Result<()> {
  if frame.size()?.width > 0 {
  highgui::imshow(window, &mut frame)?;
  }
  - if highgui::wait_key(10)? > 0 {
  + let key = highgui::wait_key(10)?;
  + if key > 0 && key != 255 {
  break;
  }
  }
  