Hi Peter,
The custom cursor effect is triggered by the CSS class t4-cursor-highlight. Any element that has this class will automatically display the highlight effect when the mouse hovers over it.
If you’d like the effect to appear on additional elements, simply add the t4-cursor-highlight class to those elements. Likewise, removing this class will disable the effect for that element.
With the Hero module you're referring to, please try this way:
1/ Open file: /templates/ja_seven/acm/hero/tmpl/style-1.php
2/ Look for this line of code and add class t4-cursor-highlight:
<div class="hero-bg t4-cursor-highlight" <?php echo $bgHero ;?>></div>