Thanks for this. I wasn't sure there was a way to do it before I found your post.
However, I'm having trouble with adjusting the size. I've embedded 3 videos on my blog but each one is a different size. I've changed the 0x0 in the code with my own dimensions to make all 3 the same, yet they're all different sizes. One is way too big.
Also, on one of my videos it says "video format or MIME type is not supported" even though my video is playable on DTube.
Any suggestions?