Sony is giving something from its labs to other Xperia devices. The Background Defocus utility present in the Sony Xperia Z2 is now available in the Play Store and you can enjoy that feature by downloading the app from the link below.
Its the one of the most discussed feature of the camera app of Sony Xperia Z2. In actual it helps to emulates a shallow depth of field, seems to be getting quite popular, as more and more manufacturers are advertising it as one of the fun ways to use a mobile camera.
It was already rooted and was available in the developer forums but now its officially available in the Play Store. As per the official note the mode still functions the same way and no new features were added. Sony suggests a distance of about 15 – 45 cm for the best effect.
It still works only on Xperia smartphones, of course, and such devices should be running Android 4.2 or higher to be compatible.
Source: Sony Background Defocus