Edpuzzle

https://edpuzzle.com/
Edpuzzle allows teachers to edit videos from most video services such as YouTube, Khan Academy,
National Geographic ect...

The teacher can then add comments or questions for the students to answer in the videos.

And the best part is that it works with Google Classroom.

How???

Step 1: Find the Perfect Video

Once you’ve created an account, you can search for videos using keywords or a URL.

Step 2: Preview Your Video 

Step 3: Customize Your Video with EDpuzzle Tools 

EDpuzzle lets you trim your video to use only the parts you want students to watch. It’s easy to eliminate advertisements and keep the video length appropriate for your age group. Teacher tip: Limit the length of a video to the age of the students you are working with.

Step 4: Add Questions to Get Students Thinking Critically

You can add audio clips throughout a video or narrate the entire video using EDpuzzle.

Teachers can design open-ended questions to get students thinking more deeply about the information presented in the video. These open-ended questions are a great way to begin discussions in class the day after students have completed this assignment. 

Alternatively, teachers can pair an EDpuzzle lesson with a TodaysMeet backchannel and ask students to share their thoughts on the open-ended questions on the backchannel in an informal asynchronous conversation.

Step 5: See How Your Students Did On This Assignment!

The teacher dashboard makes it easy to see the assignments for each class and monitor which students have successfully completed each flipped lesson.

How to create your first video lesson:
https://edpuzzle.zendesk.com/hc/en-us/articles/205958502-Create-your-first-video-lesson