Backstory: Video is on the rise and people are putting forth a lot of effort to create great content. Why not take advantage of that content and replicate it in a blog post?
The Idea: A service that converts youtube videos to blog posts.
Deep Dive: You would build a simple platform for customers to submit their youtube links and you would pair them with writers to translate the video content into written content.
This would function similar to design pickle, the platform takes care of the customer to writer matching and vets the writers. You would have to implement a screening process for hiring new writers.
Validation: There are already a lot of translation services for videos.
Monetization: You would take a percentage of the fee given to the writer.