Hi guys,
I am running some tests with multicast video in my network. I'm able to access the video streams without issues in the multicast switch, but I don't know how to forward the multicast flows via a routed network (Layer-3), I'm attaching an image here showing my network diagram, the idea is to receive the multicast signal from the GPON ONU connected to a Huawei OLT in bridge mode.
What is the configuration in the mikrotik that I have to do route the multicast flow?

You need to configure "multicast routing"
https://wiki.mikrotik.com/wiki/Manual:Routing/Multicast