For extracting 7z archives you need 7zip or an achieve tool (that supports 7z) to extract it.
once extracted it will become X.XGB
the video resolution is 1920×1080
it doesn’t take that much time to extract it
Playback:
sorry about two video files and their giant size
Use vlc player http://www.videolan.org/vlc/index.html
if asked for index rebuilding
you can rebuild it and run it or just run it
or spalyer (shoot player)
(may need to flip the video)
just enable rotate and flip it