[Bug 757927] tests:video: Fix overlay rectangle leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757927

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 315226
  --> https://bugzilla.gnome.org/attachment.cgi?id=315226&action=edit
fix memory leak

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