For VCA by NVR (needed for your non AcuSense cameras) the 'engine' can only do perimeter protection (line crossing/intrusion) OR motion detection. For perimeter protection, the NVR may be limited to a particular number of channels. You need to decide for the non AcuSense cameras whether you want motion or perimeter protection.
Human/Vehicle is available on Acusense cameras for both motion and perimeter protection; in fact you can use both simultaneously when VCA is 'by camera'. That's one of the benefits of having the camera doing the processing (where capable) as it's unrestricted. If your non AcuSense cameras aren't giving you the option of Human/Vehicle on motion, it's because the engine is configured for perimeter and so it's unavailable.
Yes and yes, but it's a bit of a faff on to switch....
Incorrect. I only have the NI NVR and have the event/human/vehicle filter in Hik-Connect for all of my AcuSense cameras. The ability is restricted to certain models and firmware versions. Some older models that are no longer receiving firmware updates (apart from security ones) will never have it (NI-I series being an example). Some old models have new enough firmware to support it; the original DS-76xx-NI-K2/xP for instance has it from about version 4.72 or 4.74 onwards. All you can do is to update your NVR to the latest possible version. If it doesn't have new enough firmware to support the feature there's nothing that can be done. Also keep in mind the feature only works for NVRs added to a Hik-Connect account. The filters do not appear for NVRs added as a local device by IP/Domain.
So back to how you sort out your config. My advice would be to:
- select each camera in turn, select line crossing and where available set it to VCA by NVR then save.
- if set delete the line crossing, save, untick the enable box, save (if you've messed around with intrusion do the same)
- if it's an AcuSense camera, reselect VCA by camera, save. If it's a non AcuSense camera, leave it on VCA by NVR
- repeat for all cameras
Once done the NVR AcuSense engine should not be in use, as you've deleted and disabled all events using it. So you can go ahead and set up your AcuSense cameras as you wish using motion and/or line crossing and/or intrusion.
You should now be able to chose whether to use perimeter OR motion for the non AcuSense channels. If it still won't let you select motion with Human/Vehicle on the first camera, you'll need to find the engine configuration in the local menu. It shows what resources are in use and will allow you to switch between perimeter and motion. I can't recall exactly where you'll find that as I don't have an NXI that I can check but the above should assist.