When trying to capture camera video from browser using MediaDevices.getUserMedia, user consent is required. On first call the browser will show a dialog to the user who can either allow or block access to the camera. It might be useful to have some analytical data for your application on how many users blocked the camera access, but unfortunately there's no direct way to detect from code when the dialog was shown and how the user answered.
If you want to use Google Analytics as the analytics tool for your Ionic mobile application or progressive web application (PWA), there's an Ionic Native wrapper available for the Cordova plugin with support for mobile platforms as well as the browser (web) platform. Unfortunately, it consistently threw errors for me, when I tried to send a screenview event for the entry page.
AWStats is one of the most popular tools for generating web site statistics from server logs. I've recently set it up on my Windows web server to generate statistics for my blog. This post contains the required steps to make it work.