Where is FPSStreamingCast?

Hello, all!
So now I need to develop a casting/streaming app for nreal.
I looked at nreal sdk doc and found this:
This is exactly what I needed, I probably need to modify it a little.
However I can’t found the files in the sdk.

So where I can get it? I think it is a very useful function.

probably you have solved it by now, but for others having the same question:
You have to contact the Nreal developers (@XREAL-dev), they will send you a beta version of the NRSDK which includes the FPSStreamingCast prefab and the StreamingReceiver.

Oh, thank you for your reply!
I will try to contact them.