A free service for taking notes of any online lectures has been created. The service synchronizes not only with YouTube and Vimeo, but also with Coursera, EdX and Khan Academy.
Also, it is integrated with Google documents, which makes the task of taking notes of any online lectures even more elementary. The structure of the program is quite simple, in one part there is a video, the playback speed of which can be adjusted, and in the other - a document for recording.
In addition, if necessary, you can leave questions that appeared after watching a certain segment of the video.
You can start using the service on the website VideoNot.es, it's free and registration is quick.