If I have heard correctly, Krishna married ( did Gandharva Vivaah) to Radhaa in seclusion in Bhaandirivan, per Harivamsa scripture.
This video does not provide source scripture of the story. The story gives the impression that Krishna did not know he is the Supreme Personality of Godhead until after Gargacharya informed him so. The story given the impression that Krishna was an ordinary human till he got a realization at the top of Govardhan mountain. This is not true per Srimad Bhagavatam PuraN, that has many stories about Krishna implying that Krishna knew from the appearance that he was the God Supreme. For example, there is one story in which Lord Brahma decided to test if the cowboy Krishna is the God Supreme. So, Brahma, hid all the Krishna’s cows and friend boys in a cave. When Krishna did not see cows and friends, he knew that Brahma has hidden them in a cave. So, what Krishna did is, He created duplicate all the cows and friends, and created a scene that looks as if nothing has happened and all is well as usual. When Brahma saw Krishna with his cows and friends, he got bewildered, and could not figure which set of cows and cowboys are real and which are not. Thus Brahma realized that Krishna really is the Supreme God, and he immediately came to Krishna and begged pardon for taking away the cows and cowboys.
This and some other stories in Srimad Bhagavatam clearly informs us that Krishna really knew from the time of His appearance (and before) that He is the Supreme Personality of Godhead. This fact is very important for Krishna devotees.
jaya sri krishna!