stop stream when no one watching - save bandwidth
**Is your feature request related to a problem? Please describe.**
**No**

**Describe the solution you'd like**
**Ability to set camera.ui the way that it starts video streams when someone request the stream, either by detecting logged user or other way**

**Describe alternatives you've considered**
**web ui with button to bring up docker on request. however not user friendly and needs manual shutdown afterwards**

**Additional context**
**Is there any other bandwidth saving feature I am not aware of?**
