Ok so to achieve what you want, switch the project to Builder Layout (small metabox on the right), and then add Media Grid block to which you can insert multiple items, including bigger video like on your example url.
Thank you for your reply but switching to builder and media grid doesn't seem to work. Even though the URL section is complete, when I view the page it does not display anything. The page remains blank except for links to the next or previous portfolio item.
Originally Posted by Ante
I have set up an example for you on the project you mentioned. Right now it's only a single column with the huge video. Feel free to tweak it as you want.