wpForo Embeds addon adds a function in core which replaces all 3rd party URLs to according player or widget. For example Youtube share URL to Youtube Player. SoundCloude share URL to SoundCloud widget with players and so on, the whole list of 3rd party services are listed on Addon page and in your Dashboard > Forums > Settings > Addons > Embeds admin page. You just need to put 3rd party service share URL in post editor and save post. There is no tools on editor, this is a 3rd party content embeder.
You can upload your video in Youtube and put the Youtube URL in your post. Or you should by wpForo Advanced Attachments addon for advanced attachments options. It also have HTML Audio and Video players for self-hosted files.