i was thinking if there was anyway to add a okay icon overlay for video post types, i already came up with a code that allows me set up a default thumbnail if post has no thumb, sample code below.

<div class="img-responsive"> <?php if ( has_post_thumbnail() ) : ?>
    <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('big-grid-one-image'); ?></a>
<?php else : ?>
    <img src=" <?php echo get_template_directory_uri (); ?>/img/no-thumb/acardio-548px-450px.png" />


<?php endif; ?></div>