Auto focus with video

NikNIkon

New member
Hi, I've owned a D810 for the last couple months and part of the reason I bought one was to use the video recording function. I've seen a couple videos on youtube that demonstrate the D810's performance using auto focus with video but for the life of me I can't figure out how to make mine AF. I'm aware that the results may be varied but I'd like to know how to use it in some cases. Anyone have any idea on this?
 
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