The add-in never collects, stores, or transmits information that can be used to identify you, except for PayPal data: If you use PayPal to contribute, then PayPal provides Web Video Player with the email address and name from your PayPal account.
Google is used to track traffic, so they do collect metadata such as how many people use the add-in and how often, but not any personally-identifiable information.
For other information about Web Video Player, see the main Web Video Player page.