I'm not sure if the webm video player extension and the input extension I used works on Mac. I'd have to check if building for Mac is a possibility as I don't know if it's any different in GameMaker than building for windows.
I just checked and in order to build my game for Mac OS I need a paid license for using specific software that GameMaker needs to build for that operating system, which I do not have the funds for. So unfortunately Mac support will not be added sorry.
