private function getVideo($videoId)
    {
        if (!array_key_exists($videoId, $this->videos)) {
            $options = new VideoRequestParameters();
            $options->setIncludeCustomMetadata(true);
            $this->videos[$videoId] = $this->client->getVideo($this->vmId, $videoId, $options);
        }

        return $this->videos[$videoId];
    }