detail.php

<?
/** @var $item \SH\Entities\People */
$item = $arResult['ITEM'];
?>
<div class="static-content text-content">
<?= $item->DETAIL_TEXT ?>

<? if($item->hasProp('YOUTUBE') && ($youtubeId = $item->getPropValue('YOUTUBE')) && ($youtubeId = getYoutubeId($youtubeId))) { ?>
    <iframe width="704" height="474" src="https://www.youtube.com/embed/<?= $youtubeId ?>" frameborder="0" allowfullscreen></iframe>
<? } ?>

</div>