I'm not familiar with this hardware!
You need the possibility to access each camera through a direct Url. If this is possible you can receive the video data from each camera.
So have a look into the device manual or ask the manufacturer support for these direct Urls.
Here you can try possible Urls for receiving video data:http://skjm.com/icam/mjpeg_test.php
If the direct access through an Url (IP address) is possible, you can use any browser to access your cameras.