EDpuzzle: https://edpuzzle.com
It allows one to 'crop' selected portion of a video clip; add comments and quiz questions.
The clip can be shared publicly or assigned to selected group of students (who needed to be registered as they would be given an access code).
The clip can be embedded into websites like blog.
Alternatively, it also gives you the LINK to access directly.
Application: Flipped Learning
Here is a 'sample' created using EDpuzzle:
To assign the clip to the class so that we can keep track of the quizzes responses