I played around with this a bit to develop https://www.findlectures.com, so knowing what works/doesn't work there I'm developing some NLP scripts to support my use cases.
I never thought about this particular use-case. The subtitle for TED talks should be an ocean of info for you to extract keywords from :D Pretty neat site you got there. I will be using it. Thanks!
https://alchemy-language-demo.mybluemix.net/
I played around with this a bit to develop https://www.findlectures.com, so knowing what works/doesn't work there I'm developing some NLP scripts to support my use cases.