Yeah, fake. My guess is he took the Healthbook icon from other leaks and built an app in Xcode that just crashes every time it launches and spoofed the version number.
The only unexplainable things are Control Center and the "Search your iPhone" versus "Search iPhone". I'm guessing those may have been changed by a jailbreak tweak of sorts. Maybe Cydia is hidden away.
Plus, iOS 8 is still half way through beta and is only in testing at Apple HQ so I doubt this is real. I would also think someone who is beta testing iOS 8, rather at home or at Apple HQ would be using a fresh iPhone. That is, no previous data. It looks like this phone is this guys daily driver.
I couldn't watch that piece of ****. The video creator has to be mentally challenged.