Some doubts about video recording

Aug 19, 2016
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Hi.
I've been using my S7E camera for some time, but I rarely use it for record videos, so I would like to make some comparison tests. For this, I would like know:
- How can I record HDR movies? Just use the same option used for taking HDR pictures (hdr button at the screen's top or left) to enable it and then start recording a video?
- When I disable video stabilization, both optical and software video stabilization are affected? Is it possible to select which one to use?
- AF tracking is a tool that will keep focusing a selected subject no meter if it gets closer or further or change its position or if I change my position? Why can't I use this with video stabilization enabled?

Thanks in advance.