[Bug 739846] opencv-example: Use snprintf instead of sprintf

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739846
  GStreamer | gst-plugins-bad | git

--- Comment #4 from Hyunjun <zzoon.ko at samsung.com> 2014-11-09 23:48:44 UTC ---
(From update of attachment 290294)
Yes. I also think g_snprintf is better. Thanks for advice.

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