It’s really straightforward. You just install the HomeKit plugin then any other plug-in that you want to be exposed to HomeKit. It creates a bridge in your home app, just like HASS does with the HomeKit integration.
It works well and the creator is constantly updating/improving.
My use case for it is to expose my rtsp cameras and let’s me use them with HomeKit Secure Video.
One thing to add though, HomeKit Secure Video only supports 1080p. So if your camera is higher resolution, it would just reduce it.