Help, why isn't VoiceOver giving me feedback when shooting video with my iPhone?

Hi everyone, I know I haven't posted in a while, but I have one quick question. I recently got into the idea of videoing, and when I video, it's supposed to tell me if I am in focus or not, example, one face, center, but it doesn't. I have tried turning off lock orientation, raising brightness, everything, and I just finished resetting my phone, but no luck. Hopefully one of you can help. Thanks, for the reference, I have an iPhone 6, running the latest version of iOS.