curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

$video = "http://videoxxxx.com/video.mp4";
$post_url = "https://graph-video.facebook.com/" . $page_id . "/videos?"
. "title=" . $video_title. "&description=" . $video_desc
. "&access_token=". $access_token;
$ch = curl_init();
$data = array('name' => 'file', 'file' => '@'.realpath($video)); // use realpath
curl_setopt($ch, CURLOPT_URL, $post_url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$res = curl_exec($ch);