Converting Member area videos from flash to HTML.

Need help converting videos in adult website Membership area from flash player to HTML. Members area uses WordPress. Also we now have aMember software installed and there is Proxy Pass security on the site. There are approx 500 videos and most have mp4 version already in the members area as they are several formats for users to download. I have time to convert things if I am shown what to do – i.e. I can edit 500 pages to add code. Time is important to me. At the outset be honest and let me know how long you think it will take. I have time off now for Xmas so i can help do changes.