Kindly follow the below step to modify our default gallery video thumbnail.
Video Thumbnail
When you have added the video under the Admin Panel > Portfolio > Add New Video, by default it will display out video placeholder image.
Open the file in this path /wp-content/themes/onelife/tpl-portfolio.php using some editor like DreamWeaver and scroll to line no:178 approximately there you can replace the image.
In this way you can change the placeholder image under the files /wp-content/plugins/designthemes-core-features/custom-post-types/templates/taxonomy-portfolio_entries.php and wp-content/plugins/designthemes-core-features/shortcodes/shortcodes.php
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