Chrome extension for loading remote-stored video captions

Deaf people use closed captions for video. HTML5 has a <video> element. To load captions for a HTML5 video, you put a link to the cation file (WebVTT) below the <source> element, inside the <video> element. See [login to view URL] I want to create a non-profit organization that will provide captions for video that don't have them. I will host the captions files on my server. At page load time (on DOM ready) I need the browser extension to check for the presence of HTML5 video on the page. If there are <video elements>, then check for captions in the page/DOM. If they are not there, then the browser extension should check with my server to see if I have the captions. If I have the captions, return a link to my caption file and insert the <track> element in the DOM with the appropriate link for src. If I don't have the caption file, add the video URL to a list of requests. Deliverables: 1) Script to set up a simple MySQL database with two tables. table 1: requests columns: ID (unique auto-increment) Video: URL to the source <video> element TimeRequested: timestamp Response: True or false, depending on whether we had it in the other table table 2: captionFiles ID: unique autoincrement video: URL for the associated <video> captions: URL for (hosted on my server) caption file that matches the video. Must be MySQL database / table. 2) Web API to server the caption files requests. API Takes a URL (for the video), returns a URL (for the caption file we're hosting) or false if we don't have it. In your bid, tell me how you would implement this simple API. I don't have a strong preference. 3) Chrome extension to automatically check , on DOM ready, for local captions <track> element first then remotely-hosted captions if they aren't present locally, and insert the <track> element in the DOM as appropriate. Project is not time-sensitive but I don't want to take more than a month for it.