Customize a template and add some video options

I am a visual effect artist, I am trying to build a new site to put my demo reel and some videos and image works. I found a template already but it doesn't have video option, all I need it's to add some code in the template to make it easy to update with my videos or images. when it's done, I need you to tell me where I can change those links or switch between video or image (I will put some video on the host site). I was a web designer, I understand the concept but I didn't work on html or css since long time, so I really need you collaborate with me and propose even a better solution to keep it easy to update. I need to keep the main structure of template because it works well on multi-platform, pc, mac, ipad, iphone, android phone etc. Hopefully, you are a clean coder, that means I hope you will put comments detailly to make it easy to understand even 1 year later, when I need to update my demo again. here is a preview how it looks like : [login to view URL] This is a really sample project, it may take you 2-5 hours on production part, but we do need to communicate on skype or google hungout to communicate well.