It doesn't take any great programming talent to embed a video into your writing or group post. Hell, even John did it!
In any Writing or a new Group Post, leave the link to the video on its own line. Don't write on the line with the link. That's all!!!
For example, this will work:
This will not:
Here is another test https://www.youtube.com/watch?v=VaXLtPGrTGQ
Please note you need to use the WATCH link, not the EMBED link from youtube.