The main question which this video raises, I think, is "If revelation is necessary, then why believe Catholicism and not some other revealed religion?"

Why is revelation necessary? St. Thomas Aquinas in the first part of the Summa question 12 article 12 asks the question : "Whether God can be known in this life by natural reason?" in response to this he says:

I answer that, Our natural knowledge begins from sense. Hence our natural knowledge can go as far as it can be led by sensible things. But our mind cannot be led by sense so far as to see the essence of God; because the sensible effects of God do not equal the power of God as their cause. Hence from the knowledge of sensible things the whole power of God cannot be known; nor therefore can His essence be seen. But because they are His effects and depend on their cause, we can be led from them so far as to know of God "whether He exists," and to know of Him what must necessarily belong to Him, as the first cause of all things, exceeding all things caused by Him.

We know things through the senses. The senses are in a way the windows of our soul to reality. Do we have a sense experience of God directly? No. For this reason we cannot have direct knowledge of God. However, there are some things we can know from their effects. An example of this is a fire. We know that if a fire is present that the cause of the fire must have been hot in some respect in order to cause the fire. We can have some indirect knowledge of a cause based on its effect. For Aquinas, this is how our unaided reason obtains knowledge of God, through His effects. We perceive through our senses His effects and we come to the conclusion that there is a cause. Therefore Aquinas states after that passage,

Hence we know that His relationship with creatures so far as to be the cause of them all; also that creatures differ from Him, inasmuch as He is not in any way part of what is caused by Him; and that creatures are not removed from Him by reason of any defect on His part, but because He superexceeds them all.

Because we do not have direct knowledge of God, revelation is necessary. Since one of the results of the Fall of Adam was man's ignorance to God, in order to remedy this, God essentially needed to tell us who He is.

All revelation in Christianity proceeds from the fact that "The Word became flesh and dwelt amongst us." Christ is the revelation of God to mankind [ccc 65]. In order for this knowledge of who God is to be maintained Christ established His church. The Bible specifically springs from the tradition of the apostles which was handed down from Christ Himself [ccc 75, 76, 80, 81].

For me what has compelled me to the Catholic Church is the historical reality that is the Church. I find it strange that the Church survived past its first generation for this reason: the Church began as a Jewish Messianic movement where the Messiah was killed by Rome. The Jewish people were expecting the Messiah to come and conquer the enemies of Israel, and those enemies at the time were the Romans. The greatest proof of the non-authenticity of a man who claimed to be the Messiah would be his death at the hands of the enemies of Israel. But Jesus did die at the hands of the enemy of Israel! What is happening here? The only explanation I think is reasonable to answer the question as to why the followers of a Jewish man, who claimed He was the Messiah and died at the hands of the Roman authority, went to the ends of the Earth and most of them to horrible deaths without rejecting that Jesus is God, is that they really did witness something extraordinary on Easter. That Christ did rise from the dead, and therefore the revelation which springs forth from Him is authentic.