I am unable to download video due to this control measure
Can anyone help me to download this video
Go to developer tools -> Go to Network Tab -> Filter all results by "Media" -> Shuffle through video -> Grab mp4(mp3, whatever) link that pops in the network tab.
If it's a direct link, simply download the video, if its a blob link, use VLC to download it.
Have you tried contacting the authors? You could ask the authors to share the video with you. If you want to use it for educational purposes (I see you have some kind of note taking application running) they may not have a problem sharing it with you (I know I wouldn't).