SKJM offers an app called IPcam that will allow you to use your iPad as an IP camera. However, this app does not do the job of icamsource, unfortunately...meaning you still need icamsource.exe running on a computer (preferably on the same network).
If you have a static IP address, or use ddns, you could just view the video feed without using icamsource.exe by using your Safari browser on your phone. However, you would not have any functionality of iCam since you wouldn't be using icamsource. In other words, there would be no motion detection/alert, no motion event recording, etc.