I'm terribly sorry if this has been asked before, I did a search but I couldn't find a similar question so again, I apologize.
Could someone tell me how to do these things?:
I have a split screen video (I know how to do that), and I want to fade one side out to black, and fade it back in throughout
Also, if I have one video (not split screen, just one fullscreen video), fade it between two videos (so that you can see both videos at the same time for a bit, kind of "ghost like", and then it will eventually transition to the other video). This effect is used in a lot of music videos, or Especially in a movie when time is passing by (like years) or there is a "flashback". You can see two videos at the same time on top of one another.
Again, sorry for the trouble, but if anyone has an answer thank you in advance!