Apologies my French is not good, but for LiveView over USB, the max resolution for Nikon cameras, is about 640x424 (or something close) on SOME of the new ones, D5? D6? , there's a setting which can work I believe, to get up to (from memory 1024x???)

For the D5100:
* USB Liveview: 640x424
* HDMI: 720p or 1080i (at some frame rate)
* Record: same as the above.
* Record and capture (via USB): same as above.
You can (as I do) use a HDMI capture card to grab the higher resolution video from the HDMI output.

sourceforge.net/p/gphoto/mailman/gphoto-...ail.com/#msg28828770

Note that remote control via USB and HDMI are mutually exclusive.

As far as the Z7: I think there's a setting, it MAY be: LiveViewZoomArea to get it up to a bit better resolution? or /main/capturesettings/moviequality seems to have 1280x720, so that might work? (Might be the recording setting?)

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