It is possible to bind Command Key from mac os x in zsh? I can't find any information about that.
Yes, but it's not as straightforward as you might hope.
First of all, the Mac OS doesn't pass a control sequence to applications when command-key combinations are pressed. Applications instead offer functions to the OS which can be executed via Apple Events. The binding of key combos to the specific apple event occurs at the OS level.
The best solution I can think of would be along the following lines:
Write an AppleScript which does whatever you wanted to do; use the
do shell scriptcommand to execute shell commands – or write a shell script if that's preferable. Either way, this approach will open a new terminal window for each command run, however.
Alternatively, figure out a sequence of keystrokes which will generate the desired behavior (e.g. you should be able to type "top" to start up top in the current shell window).
Use Automator to create a service which either runs the AppleScript (or shell script or whatever), or types the keystrokes. Assign this service to Terminal, and assign it a keyboard shortcut. This guide walks you through that process: http://www.makeuseof.com/tag/how-to-create-your-own-services-menus-mac/
Approach 1 is imperfect because you can't run it in the current window shell session. Approach 2 is imperfect because it will give undesired results when the active shell session is running anything other than zsh.