Add tracking code to body

it says body tag of each page… but im going to put it in the global header and see if it works
<script type=”text/javascript” src=”//tag.brandcdn.com/autoscript/annamariacharters_vfdwsk0wnxfhelu9/annamariacharters.js”></script>
i assume use the google analytics section? or should i use a function. i already have google analytics number in there.

I did this

function ovacam_add_gtag(){
?>
<script type=”text/javascript” src=”//tag.brandcdn.com/autoscript/annamariacharters_vfdwsk0wnxfhelu9/annamariacharters.js”></script>
<?php
}
add_action(‘wp_head’, ‘ovacam_add_gtag’);