I think it's the 7 and 8 series cameras which can do two AI rules at the same time.
As Wittaj said; the trick people (myself included) use is IVS by camera and Video Metadata by Recorder (for NVR5xxxx -I -EI - EI2).
But that being said:
Some newer 3 and 4 series cameras with AcuPick do effectively Video metadata (that's what Acupick is based off) and IVS at the same time.
I trying to implement the features on an IPC-B54IR-ZE. Not sure if it's an S2 or S3. I don't know if the Dahua 5216 NVR has video meta data. I haven't messed with the NVR settings, as I was trying to contain all rules to the camera to lighten the load of the NVR and maintain bandwidth