Privacy Zones
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**Is your feature request related to a problem? Please describe:**
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I'd like to be able to set and remove privacy zones via HomeKit.
**Describe the solution you'd like:**
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Ideally this could work as a config requesting the points that the zone would cover as a grid, or an option to blank all of the feed.  This could be show as a switch that can be turned on or off via triggers. 
**Describe alternatives you've considered:**
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I can't think of any short of using the unifi protect app which is a bit cumbersome as even they don't have the ability to save zones and just turn them on/off, you have to redefine the mask every single time.
**Additional context:**
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I'm not sure if this is even plausible.  The reason I want it is I have a couple of indoor cameras that I want to mask when someone is in the house but then show the feed when we're out, or if something happens like a smoke detector is triggered, etc.  
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