How to access Infinity focus setting for video?

[bloodfire1004]

As per this post: http://talk.sonymobile.com/t5/FAQ/Capture-better-photos-in-low-light-conditions/m-p/395397#U395397

using the Infinity focus setting supposed to improve low-light video capability.

But I can't find it in my Xperia Z1 Camera App. It seems that article is a generic one and thus why I cannot find the same setting.

So how to set Infinity focus setting for the Z1?

[Rickard]

The FAQ is general and available options can differ depending on what phone you have.

When using manual mode for video recording in Xperia Z1 you can select between Single auto focus, Face detection and Object tracking. Which one you should select depends on what your filming.

[bloodfire1004]

Yes I understand, but is there no equivalent to set the focus to Infinity? So that everything will just be in focus with no need for continous autofocus, just a fixed focus?