Hi, I would love to work on this project :)
I messed around with different HTML5 media players quite a bit when creating a custom WP plugin for another client that required advanced control over subtitles, and I came across JWPlayer as well, and got the basics of the plugin down.
I'm open to learning and therefore I'd be happy to dig into the advanced concepts of JWPlayer in order to customize it. Contact me for additional information or if you'd like to discuss the customization matter a bit further, I'd be happy to hear about the details :)
Best regards,
Kauri