Yes, this also is an area your security professional truly needs to be in involved in. CCTV with audio recording has different legal implications from state to state.  Before installing audio recording devices check the laws of your state.

Yes, PTZ or Pan-Tilt-Zoom control can be accomplished over a network or even from your smartphone.

Yes, most all DVR / NVR’s allow alarm scheduling.

Yes, email notifications from motion to the status of a units HDD are available and can be custom tailored to the client’s preference.

Most modern DVRs have the capability to view and manage your system remotely. With remote access you can view your DVR video over the Internet or via a smartphone app. A high speed internet connection is best for remote monitoring.

Multi-camera systems are very common and widely used today. They generally are deployed in 4, 8 and 16 camera configurations.

A positive ID is possible from some cameras, the trick is to having the right camera angle and with the proper lens a PI can be made. Generally 70% of the screen needs to be filled for a PI.

Yes and No. Monochrome cameras or B&W cameras are really a thing of the past. However most all color cameras today have a Day/ Night function. The camera switches to a monochrome camera once the light level becomes too low. To further increase the cameras sensitivity IR illumination is also used. The manufacturer uses a solid state LED,  that outputs in the infrared spectrum generally between 800nm and 850nm making it nearly invisible to the naked eye, yet allows the camera to see in total darkness.

4K Ultra HD 3840 x 216016.9

Analog cameras generally will provide 500-600TVL and your Mega Pixel cameras HD 1280×720 as well as Full HD 1920×1080