How to get railer rights ?

There are many youtube channels that shows upcoming movie trailer and gaining
awesome views every minute.

Some of them are -

https://www.youtube.com/user/movieclipsTRAILERS
https://www.youtube.com/user/popuptrailer

Anyone youtube guru here who knows how to get rights of these trailers ?

i am not a guru , but as far a i know they might be contacted by many to show the trailer.

you may build a good looking channel with fake subs and some videos+views and then mail the film support most will be happy to get their trailer posted on your channel. after your channel gained authority people will contact you themselves.
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