Hi, will have to do a little trick here to make it easier for you.
We will use one of the portfolo Details: fields for this.
1. Open single-portfolio.php and delete
<?php if ( get_post_meta($post->ID, 'pf_meta_box_text6', true) ) : ?>
<span class="portfolio_detail_title"><?php echo get_post_meta($post->ID, 'pf_meta_box_text5', true) ?></span> <?php echo get_post_meta($post->ID, 'pf_meta_box_text6', true) ?><br/>
<?php endif; ?>
2. Open portfolio template you need and find these lines in the code
<?php } else {?> <a href="<?php echo wp_get_attachment_url( get_post_thumbnail_id($post->ID) ); ?>" class="mosaic-overlay"> <?php }?>
<a href="<?php echo wp_get_attachment_url( get_post_thumbnail_id($post->ID) ) ?>"><?php the_post_thumbnail('portfolio-three', array('title' => "")); ?></a>
change them to
<?php } else {?> <a href="<?php echo get_post_meta($post->ID, 'pf_meta_box_text6', true) ?>" class="mosaic-overlay, fancybox-youtube"> <?php }?>
<a class "fancybox-youtube" href="<?php echo get_post_meta($post->ID, 'pf_meta_box_text6', true) ?>"><?php the_post_thumbnail('portfolio-three', array('title' => "")); ?></a>
3. When creating portfolio item you see three Details fields. The 3rd line is URL: - Enter video url into the field next to URL
This is the video link you want, but also remember that you still have to add featured image, but the link to it will be pulled from field next to URL.
4. If auto detect for videos is selected in media setting it will open up in lightbox.
Cheers
It looks like you're new here. If you want to get involved, click one of these buttons!