Thank you for both answers.

Martin – please correct me if I am wrong – from what I understand by using this migration wizard tool I can change main domain of all my videos and other related files, but it has nothing to with main site domain (domain that wordpress is using), right? So after using this tool my main website domain will remain domain.com, however every existing link to video/stream/m3u8 will be changed to streaming.domain.com, and every new video I add in the future will also have url streaming.domain.com/blahblah, even tho I will be using wp-admin area within domain.com, yes?