One way to hide the navigation bar is by editing the build.prop file by adding a new line to it: qemu.hw.mainkeys=1
What it does is completely disable the navigation bar, so we need a new way to navigate without it. An easy way to do that is with an application called Button Savior. The app will enable hidden on screen buttons that are very responsive and will allow you to access home screen with ease while enjoying the beautiful display, now in full screen!
Here's a list of applications that work and can be used to navigate without the original navigation bar:
1. Button Savior (back button does not work)
2. Handy Soft Keys (when enabled the "Ok Google" feature does not work)
3. Pie Control (paid application, but developer offers it for free to XDA users http://forum.xda-developers.com/show....php?t=2454531)