The app only shows information about how to use the extension and a button to open the extension’s preferences in Safari.
*.zoom.us pages. Zoom In is unaware of any other pages you navigate to. It can’t see them or track them or whatever else. All it does is look for the native Zoom URL on Zoom pages and pass it along to its native counterpart.
You can see all of the source code for the app on GitHub. Feel free to build it yourself (although please don’t redistribute it). If you have any questions, please open an issue on the repo. I’d be happy to answer them!