The video didn't really tell you how to "explain" 1914 in detail. To do it as the video shows you have to do many things.
1. You automatically accept that 607 is the date of the fall of Jerusalem.
2. There was no explanation about why it was a literal 7 years for Nebuchadnezzar but it is 2520 years in our day. They try to say Jesus in Luke indicates that it is longer but Jesus is talking about the coming destruction of Jersusalem that occured in 70 ce.
3. No explanation on why you count 7 years in 360 day increments.
4. No explanation about a day for a year and why it applies.
5. No explanation why you can cherry pick scriptures from all sorts of different books and somehow they all are a part of the same prophecy.
6. Correct me if I am wrong but isn't this a type/antitype that they are doing away with?