A. Through the coming of the Holy Ghost the Apostles received the "gift of tongues," by which they could be understood in every language, though they preached in only one. Q. 447. Why did such ...

For it is by grace you have been saved, through faith … it is the gift of God ... The Holy Spirit came to the apostles in the form of tongues of fire that rested on each of them without burning ...

In the video the apostles witness a strange event, including a mighty rushing wind and tongues of fire, which they believe to be the gift of the Holy Spirit, which Jesus had promised them.