Piggybacking Second VMS Onto IndigoVision System?

We have a potential customer keen to trial a video analytics system, however for at least the next year they are "trapped" with an all-IndigoVision surveillance system (cameras and VMS), and it seems that IndigoVision don't / won't provide a suitable SDK for integrating the video analytic. The simplest solution for a trial could be to bring along one of the more open VMS that integrate with the analytic already, and piggyback it onto the cameras, but as I understand it you can't do that at all with IV cameras, you can only use them via their VMS - is that still true these days with ONVIF etc?

Does anyone have any experience in attempting anything similar to this, or able to offer thoughts or opinions?

Is the only solution to bring new cameras as well as VMS for the trial (argh!) and ignore the IV system altogether?

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