If you want to be able to push your viewers to another website such as an online store or a crowdfunding page, one way to do this is the put the URL of that page in your video's full description, which will turn the URL into a hyperlink that viewers can click on.
From your admin, navigate to Content > Videos, and select the video you want to edit.
In the General settings, paste the URL into the Full description.
Note: URLs do not become hyperlinks in the Short description.
When you save your video's settings, you will see that the URL is now a hyperlink when you navigate to the video's page on your site. This will also work on your branded apps.
Unfortunately, there is currently no way to create hyperlinks with words (e.g. "Click here") as the link in the description.