Finally, it not impossible to get the iPhone 4 exclusive application to run on other iDevices! 
Changing the string for front facing camera to false will make the app run on anyjailbroken iPhone and iPod touch as long as it is running iOS 4. Now according to the source above, you can also run it on non-iOS 4 devices i.e. devices running the old 3.1.3or 3.1.2 firmware by changing the minimum system version string. I tried this step to run iMovie on my iPad but with no success. If any of you manage to get this thing run on any non-iOS 4 device, then please do let me know in the comments section below.
Thanks to David Romhan Torres who first posted about this on Redmond Pie’s Facebook page here.
David Romhan Torres I just make iMovie for iphone 4 run on an iphone 3GS, it’s very simple just download it from iTunes, modify info.plist file and change the Minimum system version to 3.0.0 and front-facing-camera to false
Modifying .ipa files breaks Apple’s DRM. So to comply with that, I am not showing the installation instructions. 
