The platform is designed to create links to a landing page as long as there is a landing page entity that is part of the video generation process.
If you have your own landing page, create a "dummy" landing page entity on the Storybuilder Suit. The role of the "dummy" landing page is to hold the landing page URL address.
Note that the link should be https since starting July 2018, Chrome will mark all HTTP as not secure right in its address bar and landing pages will not be available on Chrome.
Please follow this document to learn more about how to integrate your landing page with your Personalized Videos.