Screen capture in Mac is all black

Screen capture in Mac is all black I'm trying get screen capture through a SSH connection. In this SSH connection, I'm using the root user.
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Guest [Entry]

"There's a command line client for the OS X screen capturing? Gosh, didn't know that.
I wonder what the man page says…

SECURITY CONSIDERATIONS
To capture screen content while logged in via ssh, you must launch
screencapture in the same mach bootstrap hierarchy as loginwindow:
PID=pid of loginwindow
sudo launchctl bsexec $PID screencapture [options]"