Extracting embedded video URL from putlocker

So I use putlocker.is a lot for streaming movies and TV shows online. Since I'm not a native english speaker, I often require subtitles for the videos I watch. Many videos on putlocker don't have subtitles embedded in them. To remedy this, I use VLC player's network stream to redirect and play putlocker videos on VLC player using downloaded .srt files to play sutbtitles with the video. For this, I need to extract the link for the embedded video on putlocker which is not visible in the source code of web page. For this I use chrome developer tools' network tab to extract and copy the link to VLC player. I will have to do this for every video I want to watch which is a bit of a hassle. Hence I want to build a plugin/software that extracts the url of the embedded video from the HTTP GET request made by the browser when I click play. Here is a screenshot that might be useful http://ift.tt/1eSa2ym. I have no idea where to start. Could anyone please point me in the right direction to get started with this project? Thanks!