I helped a friend do this a while back and yes it is possible. The model if I recall only shows "16ch 3MP NVR" or "8ch 3MP NVR" which is actually an "nvr16-7200" and "nvr8-7200" respectively. As a Hikvision, it's actually just the DS-76xx-E1/E2 series. If yours isn't the same, you can still follow this guide, but you'll need to find matching Hikvision models and respective firmware.
So to flash it with Hikvision firmware, go to
http://overseas.hikvision.com/us/, search for "DS-76xxNI-E" firmware. As of writing this, only v3.3.4 and v3.1.0 are available and I recommend v3.1.0 since v3.3.4 still has some issues that need to be worked out. See:
http://www.ipcamtalk.com/showthread...t-Event-features?p=47173&viewfull=1#post47173
Then all you have to do is follow the firmware upgrading guide from Swann:
http://www.swann.com/downloads/New_...NVR/Updating firmware on a Swann NVR Rev1.pdf which tells you to use the PC client software to update firmware. Updating through the NVR interface doesn't work and will give you a "firmware mismatch" or something.
Alternatively (or if something goes wrong), just download the
tftp tool from Hikvision and you can reload the firmware again. You just extract the tool and firmware (.dav file) into a folder, change your IP address to 192.0.0.128, make sure your computer is connected to the NVR (via crossover cable OR a mutual switch/router), run the .exe, power the NVR on, and wait. I actually had to use this method in the end due to weird issues after loading firmware using the "swann" method. You can find more information on all this here:
http://www.ipcamtalk.com/showthread...for-HIKVision-camera-and-NVR-firmware-updates
Cameras can also be converted to hikvision by using the web-interface on the camera, or through the NVR interface. Funny enough, the Swann NVR interface will actually let you upgrade with Hikvision camera firmware no problem. To get the latest firmware, you should do some browsing on Hikvision's website and find your camera, but the one that I worked on was a DS-2CD2032-I, so again you just go to
http://overseas.hikvision.com/us/ and search for "DS-2CD2" and find the right firmware for your specific model. The latest one at the time of posting for the DS-2CD2032-I is "DS-2CD2x12,2x32 IP camera firmware v5.3.0_150513". Depending on how new your swann camera firmware is, you may or may not want or need to upgrade them.
After that, you've successfully converted your Swann System (back) into a Hikvision System!
As for anyone wondering why you would want to do this:
-iVMS-4500 is leaps and bounds better than the Swannview App (on iOS AND android)
-Smart Events support (Line crossing detection, Intrusion detection)
-3MP recording at 20fps
-Custom bitrate from 32kbps to 12288kbps (main stream), 32kbps to 8192kbps (sub stream)
-40/80/160Mbps incoming bandwidth (if you use 3.3.4 firmware, which again, see:
http://www.ipcamtalk.com/showthread...t-Event-features?p=47173&viewfull=1#post47173)
-Virtual-host support, so you can access the camera's web-interface to fine-tune picture settings like WDR and enable Smart IR (Not required, as you can just plug your laptop into the NVR and do the same thing, but this is MUCH more convenient)
-Probably a few other minor things I'm missing
And why you don't want to do this:
-You'll void your warranty