define('BX_SYSTEM_FFMPEG', '/path/to/plugins/ffmpeg/ffmpeg.exe'); ///< path to ffmpeg binary

bx_import('BxTemplFunctions');
bx_import('BxDolTranscoder');

// transcoder objects which generate .mp4, .webm videos and image poster
$oTranscoderMp4 = BxDolTranscoder::getObjectInstance('bx_video_mp4'); 
$oTranscoderWebm = BxDolTranscoder::getObjectInstance('bx_video_webm');
$oTranscoderPoster = BxDolTranscoder::getObjectInstance('bx_video_poster');

// make sure to call it only once (for example: during module installation), before the first usage, no need to call it every time
$oTranscoderMp4->registerHandlers(); 
$oTranscoderWebm->registerHandlers(); 
$oTranscoderPoster->registerHandlers(); 

// get URLs of transcoded videos and video thumbnail, 33 is ID of original video file stored in specified storage object
$sUrlMp4 = $oTranscoderMp4->getFileUrl(33);
$sUrlWebM = $oTranscoderWebm->getFileUrl(33);
$sUrlPoster = $oTranscoderPoster->getFileUrl(33);

echo 'My cat:' . BxTemplFunctions::getInstance()->videoPlayer($sUrlPoster, $sUrlMP4, $sUrlWebM);