[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

Hyunjun <zzoon.ko> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #290294|0                           |1
        is obsolete|                            |

--- Comment #6 from Hyunjun <zzoon.ko at samsung.com> 2014-11-11 08:10:45 UTC ---
(From update of attachment 290294)
Rebased

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