Although it hasn't been officially updated to the KODI version of the platform, XBMC Gotham, which is the latest stable release, still works on your iOS devices to include iOS 8.1.1.
Follow these steps to install it after you have jail broken your device:
- Open Cydia
- Search and Install iFile
- Navigate to Sources and click on Edit then Add
- Add the following source http://mirrors.xbmc.org/apt/ios/
- Navigate to the source and select all packages folder
- Install xbmc for iOS
- Done, XBMC icon app should appear on your springboard.