Facebook is planning to drop support for FQL after V2.0 https://developers.facebook.com/docs/apps/changelog/#v2_0_fql
The below task could be done easily with FQL
"https://graph.facebook.com/v2.2/PAGEid_POSTid/?
fields=shares&access_token=YOUR_ACCESS_TOKEN";
I am using above mentioned endpoint.
Replace $pageID
and $videoID
(post id) with your variables.
"https://graph.facebook.com/v2.2/" . $pageID."_".$video->id . "/?fields=shares&access_token=YOUR_ACCESS_TOKEN";