You want a WYSIWYG editor which understands videos on the one side and a light blog posting engine on the other. I think something like this is not existing. Choose your devil: Go WordPress, go to a free service (like blogger) and put a custom domain in front, or accept that markdown can be used. A full featured blog editor which produces light static output is like a hybrid... it sounds to be heavy on the editor and transform part and light on the output... I think nobody is really targeting that on OSS.
Update: Maybe take a closer look to OctoberCMS. It seems to go into your direction.