Here you go - https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/nsxt_32_admin.pdf
Have I configured multicast, yes. With NSX, no. The concept of multicast PIM and RP isn't locked down to a specific vendor, my experience with multicast is via Cisco but the concepts are the same.
NSX supports PIM Sparse Mode with IGMPv2 so I would probably configure the t0 (assuming both subnets terminate to the same t0) as a static RP for the traffic. Use that as your target/receiver.
here is some additional information on sparse mode https://networklessons.com/multicast/multicast-pim-sparse-mode
I have implement multicast into production networks, nothing to really note.
