Use [embed] filter in template files

Use wp_oembed_get( $url ) instead. Make sure you echo it in your template file. So, something like this:

<?php
// tot necessary to set this but good if $url is coming from a function
$url="https://www.youtube.com/watch?v=jofNR_WkoCE";

// echo the function in your template to render the video
echo wp_oembed_get( $url );
?>