Ionic/Cordova: How to install plugin into existing project?

How do I install an additional Cordova plugin into an existing Ionic/Cordova project? I need the Cordova Camera Plugin. If I try:

cordova plugin add https://github.com/apache/cordova-plugin-camera.git

I get error:

Error: Command failed: fatal: could not create work tree dir .... No such file or directory.

You are doing the right thing but you have camera.git at the end. That is the problem. This is correct way of doing it! It worked for me.

$ cordova plugin add org.apache.cordova.camera