I've been searching in vain on how to force immersive mode on jellybean. I found out after doing some experiments with some xposed modules and I wish to help others looking for the same thing.
I was using expanded desktop mode on gravity box but it didn't provide the feature of swipe to reveal status bar so I used a work-around

you'll need : app settings [here][/http://dl-xda.xposed.info/modules/de.robv.android.xposed.mods.appsettings_v29_70ccc5.apk]
swipe status bar [here][/https://play.google.com/store/apps/details?id=cz.chladek.swipe_status_bar&hl=en]
Rooted phone
xposed installed (I assume we all know xposed framework)

how to
install every thing listed and enable app setting module under modules in xposed installer and reboot.
open app settings and choose your apps ,enable it from the switch above then under full screen, choose force..do for all apps with user interface.
open swipe status bar and enable it and ur good to go.
you can modify ur status bar using gravity box or tinted status bar,all depends on you
note: before installing xposed, take a cwm backup.

This is my first post..don't post harsh comments ..I'll appreciate corrections