We recommend using an external e-commerce solution to manage, accept payments, and handle shipping for physical goods. There are a number of potential e-commerce solutions including Shopify. After setting up your store for physical goods, you can link to the store in top navigation of your Uscreen site. For more information about customizing your Uscreen navigation links - read this help article.
Alternatively, if selling videos is just be part of your business and it may make more sense to use host your website elsewhere with e-commerce options for physical goods and then link that site to your Uscreen site so customers can purchase access to videos. For more information on this option, read this help article.