yes. all main regions can have their kingdom forged. you need to hold 3 de jure kingdom titles in the Skyrim region with continious borders, then you'll have the decision to form the High Kingdom of Skyrim. its still a kingdom title, but will give you a CB on all territories inside Skyrim. the land you hold when you form it will become de jure part of Skyrim and the other kingdom titles will become titular (when you form Skyrim you lose the other titles), and once you completely conquer another kingdom it also becomes de jure Skyrim.
once you hold 3 such High Kingdoms you can form an empire, like the Nordic Empire in this case if you hold say, High Rock and Hammerfell, and have Skyrim as your main title.
to form the Empire of Tamriel you will also need to either be Dragonborn, have a Divine Bloodline, have a claim on the empire title, or find the amulet of kings (sent your steward to look for it in Sancre Tor).
Thanks for the Info, though I'm not really interested in the Empire of Tamriel. I will have enough trouble with only the Nords
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