[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 #3 from Hyunjun <zzoon.ko at samsung.com> 2014-11-09 23:47:46 UTC ---
Created an attachment (id=290294)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290294
 Review: https://bugzilla.gnome.org/review?bug=739846&attachment=290294

Use g_snprintf instead of sprintf which doesn't check buffer boundary

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