Does iCamSource show up in the Process list in the Activity Monitor utility? If not, that would indicate that iCamSource is crashing. If iCamSource is in the process list, then the iCamSource icon should show up in the Menubar (top right corner of the screen).
If you never see the iCamSource window, than might mean that you have the Auto-Start option enabled. To disable that option, simply copy and paste the following line of text to an Applications > Utilities > Terminal window and hit Return:
defaults write com.skjm.icamsource AutoStart -bool false
Then re-launch iCamSource, and the Auto-Start option should be disabled, and the iCamSource window should be displayed.