I am working on a Django Web project. I'm trying to embed the youtube video on my website and click button to capture the video image with dragging the part of it. I followed some codes which use 'canvas2html' in javascript, but it failed catching the video image for some reason.

This is my goal.

1. see the embed youtube video on our site and stop the video when we want to capture.
2. click 'capture' button below and it activates mouse to drag and take the part of image we want to download.
3. capture that part of image and download in our local directory.

How can I solve this challenging situation?