I was also looking for this but I searched and searched and I read somewhere that in order for it to work you need two things: 1) be running a 4.4 rom or higher, and 2) have an aosp rom. Atleast that's what I got from what I read.
Yeah. Im disappointed too. I want to be able to take a picture and be able to focus on an object in the back and have yhe front blurry and vice versa. Cant find a camera app to do that :/.