We have not worked with EZVIZ for several years now.
You are correct that EZVIZ is a consumer sub-brand of Hikvision. We have never tried them on iVMS-4200 but I would expect that it may be possible to manually add the camera to iVMS-4200 if you know the IP address of the device, but I don't know how much control of the camera you will have if it does connect to iVMS.