I believe this was post-processed by the user with video editing software, but not a built-in function of the Q. Last time I checked the Q manual, there is not such a function mentioned, no matter for real-time and in-camera post-processed. Btw, please correct me if I am wrong. Still, I share this video:-
(URL: http://www.youtube.com/watch?v=oNuyME9aHf4)
Another video clip by the same user can be found below. Do note that it is not the same clip as the above (processed or not):-
(URL: http://www.youtube.com/watch?v=fzRYt2WSReU)