Is There A Simple Way To Privacy Mask A Full Screen Image But Still See Motion?

I was just asked this question. Installer has a customer who wants to watch an area of an office for activity, just to know if employees are in there. The user isn't looking for details on who is present and what exactly they're doing. They're just trying to see if anyone is present.

What are the options? I know there are analytics like Kiwi's privacy protector specifically for this application, but I believe that will be outside their budget and more complex than necessary. Has anyone tried using a camera privacy mask which pixelates on a full screen image? What about defocusing the camera somewhat? Any other options I'm not thinking of?

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** ***** ** *** needed ********'* ******** ******** **** **** **** ****. 

**** ***** ** */* interface ******* **** * PIR ****** ** ******* occupancy ******?

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********** ***** **** **** obscuring **** *******, *** would ******** ***** **** activities/areas.

 

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**** ** ** ******* with *** ***** ****** of ********:

**** ** *** **** it ******* ** **** as ******** ******* ***** solid:

***** *** ** ***** steps ** ******** ** get *** ******* *******

*** **** ***** ****, since **** **** *** entire ***** ******, ** out ** ***** ****** (like ***** *********) ***** likely ** *** *****.  This ***** **** ***** motion ********* ** ***** happen.

*****, ******! ** **** masking ** **** ****** side, ***** **** ***** run ****** **** ****** detection **** ** *** basic ***** ****** *** trigger ****** ** ********? That ***** ****, **?

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**, * ****** ********* camera ** * *******?

*** *** **** ******* a ******?

**** ***** *****? *** can *** **** ****** crisp ****** *** *** won't ** **** ** recognize *****.

Image result for lidar picture office