Er...it was made by Nintendo.
Mario was made by nintendo, wasn't he? Then came Super Mario Bros. after a few arcade games, in which the Mushroom kingdom is introduced to us. Then in the next game we get a glimpse of Subcon. And in SMB3 the Mushroom Kingdom is drastically expanded upon.
Then we have Super Mario Land, in which Sarasaland is the setting. This was also made by Nintendo, was it not? And don't forget about Super mario Worlds 1 and 2. We play in Dinosaur Land in both of them.
So quick recap: I have just shown that Nintendo has CREATED the Mushroom Kingdom, Subcon, Sarasaland, and Dinosaur Land...all regions of the Mario Universe.
Obviously, Nintendo worked with other companies to complete games. They worked with square on Mario RPG. They worked with Alpha Dream on Mario and Luigi. But for the most part (and by the most poart I mean 90% of the time) Nintendo created the gist of their Mario Universe. The other companies aided in giving them plot ideas, character ideas (Like Culex in Mario RPG...I mean come on, just the mere appearance of him reminds you of Final Fantasy).
What the...
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Oh. You said Mario Universe "video." Sorry about that...