Default Wireless Streaming to Android Media Box

Hey guys I've got a Nexus 5 (More info in Sig regarding ROM & Kernel)
And I got a top of the line Android media box with very similar specs to the N5, however I do not know how to do miracast, I would like to play dt2 on a big screen! So yes any help will be appreciated!

Sent from my Nexus 5 using xda app-developers app