There are two different versions of GravityBox: one for KitKat and one for all Jelly Bean versions. So yeah, you can run it on your device, but you will (obviously) need root and Xposed Framework.
Here's the GravityBox thread:
http://xdaforums.com/showthread.php?t=2316070
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The OP states that Touchwiz is not supported.
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Many features in GravityBox is not supported on TouchWiz, but that doesn't mean that all of them will not work. You could try and see if it works or not on your device.
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