I Want To Add An Area Crowd Alert Analytics To A Hikvision End To End System. Whats The Best Way?

I originally asked this a month ago when I didnt have all the details. The customer currently has DS-9632NI NVR, And Ds-2cd2232-I5 cameras. They want the type of analytics that will warn them if more then X amount of people are in a particular area (with multiple areas per camera).

What would be the best way?

Thank you

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