My group has been doing a similar thing - except that video quality has been to unreliable for some of the more detailed boards (Troyes, Power Grid). We needed the ability to pinch and zoom the board.

We’ve been using an app called iPhotoBot to take high res shots every few seconds. These get uploaded to Dropbox. Then there is a web server of a synced folder which builds a page of the images. Server-sent events are used to update the page.

It’s kind of clunky to set up, but I can share my code if anyone is interested. I’m also curious if there are better ways to stream high quality photos.