The Privacy indicator watches for usage of the camera or location services and displays a tattle-taling camera and/or location icon in the panel when they are being used. For camera usage, the indicator popover lists the app(s) using the camera.
You'll need the following dependencies:
Run meson
to configure the build environment and then ninja
to build
meson build --prefix=/usr
cd build
ninja
To install, use ninja install
ninja install