So, another lightbox thing. I wonder how long it will take this project to die, there are so many ghost projects like this. I think fancybox is the only one that stood the test of time and I heard that upcoming version will be jQuery free, too.
I would also suggest posting this in /r/javascript since it's likely to be seen by more people.
- I would suggest updating the codebase to use ES6 module conventions and use rollup for your build process over gulp+browserify
- Add a youtube-link that generates an appropriate embed option
- Add wrapper components for Angular, Vue and React
Aside: I'm not sure how much draw you will see for a "pro" version, but good luck to you.