|Depends what video file type they are, obviously. Nobody here can help you until they know that.|
My website techs said the people with macs must download something that allows them to play but that is ridiculous as I have no control over who comes and goes on my website
Have you never visited a website where a message says "You need to install xxxx to watch the video"? Well that's what you need to do -- put a message on your website that shows only when the plugin is missing.