I started using the Conditions and Status Tracker made by josh Here is the link https://gist.github.com/DarokinB/5776368
When using this ATM it works only for the GM. I would like my players to be able to add spell effects ETC to this. Is this possible within the current Roll20 Infrastructure?
It would be possible. It would "probably" work if you removed && msg.who.indexOf("(GM") !== -1 from line 341. That would allow anyone to execute !StatusAdd. I'm not overly familiar with this script, so I can't say for certain.
All of the chat commands in the script ensure that the person using the commands is the gm. If you want to enable anyone to be able to use them you will need to remove "msg.who.indexOf("(GM)")" from each on("chat:message", function(msg) ) method.