$file = fopen($video, 'r');
$read = fread($file, $video_size);

curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($curl, CURLOPT_POSTFIELDS, "video_file_chunk=$read");
curl_setopt($curl, CURLOPT_HTTPHEADER, [
        'Content-Type:multipart/form-data'
    ]);