How to blur the_post_thumbnail() via blur.js (jquery)?

I figured it out. blur.js needs an background-image to work.

i had to set the image as background separately:

<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' );?>
<a href="https://wordpress.stackexchange.com/questions/210956/<?php echo $imageLink; ?>">
    <div class="testbg" style="background-image: url('<?php echo $thumb['0'];?>')">
       <?php the_post_thumbnail(); ?>
    </div>
</a>

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