If you already have a webpage with content you’d like to show in Hype, the best way is to use an HTML widget. You can then use the URL for either your Vimeo account (or an individual video’s embed code) within that HTML widget to show the content.
Every Wordpress page is based on a template. If you create a really minimal template that doesn’t include a footer and header, and use that to contain your image gallery, you can easily use Wordpress as your CMS for specified blocks in your Hype document. Here’s a bit more info on creating blank Wordpress post or page templates: https://codex.wordpress.org/Stepping_Into_Templates