Videos can be downloaded for offline viewing using two methods, depending on how the video owner has enabled downloading on their video.  Please note that published videos are not downloadable by default and the video owner must first enable downloading in order to give viewers the ability to download the video. Owners can enable downloading on videos using the instructions in the article linked below.

https://classhelp.screenstepslive.com/a/1813517-how-can-i-make-my-videos-downloadable-to-others-in-my-media-in-canvas

If the video owner has enabled a download player on an embedded video, viewers can download a copy of the video by playing the video then clicking the "Download Box" icon in the top-right corner of the video player window.  

1.  In the Media Gallery, click on the video you want download to open the video's media page.

2.  Under the video player, click on the Download tab, then click the download arrow button next to the source file to download the video.