Not all of the front-ends for Hive support embedded peertube videos (iframes iirc) as of yet, but they are probably working on it.
Peertube links too.. would be nice if those would embed themselves when pasted on a hive blog. The links are always formed like this:
https://cast.garden/w/hUQobxHXfYvsTX7mFjk8PW (22 characters after the w/)
RE: Let's Talk About Short-Form Content On Hive