Hi WireGuys,
If you can provide a few more specifics to your question, I might be able to help. For instance, what situations are you thinking of using analytics for...perimeter control, business intelligence, etc? Are you thinking of systems that can work with existing assets, or add-on hardware (servers or edge-based on the camera)?
Overall, there are a number of limitations to how useful video analytics currently are, in terms of what they can do reliably. The biggest issue, by far, is false positives which lead to a low "signal-to-noise" ratio which can quickly disappoint a client whose expectations were set by watching Hollywood movies.
In any case, if you can provide more details, I'd be happy to comment further.
Adam