In My Garden features two very different video types. In the plant page I insert a video which is an .mp4 file that is uploaded and stored in the Media Library. (Poor Arlene. She’s doing all the backbreaking work).
The second method is demoed on the harvest page. I take some special code from YouTube and just paste it into the WP Editor.
Which method you use will depend on your needs and what your web host (server) will allow. I prefer using an outside service (like YouTube or Vimeo – which I use for this course) to serve up my videos.
Word To The Wise Which Means You
Late in 2018 WordPress released v5.0 and with it a new page editing system k/a Gutenberg. I have lots of videos on Using Gutenberg. I've written extensively on Gutenberg which includes WordPress In 2018 Is Getting A New Page Editor And It’s Called Gutenberg.