I made a quick search, there is a plugin through NDI to Gstreamer, but not sure about the opposite.
here is an other plugin but no description about if client or server:
Anyway, I think not myself is the only one who would be pleased to have a simple NDI server object natively in PureData.
There is an NDI SDK which would be easy to implement into PD, but as I am not a coder, probably better if do not express anything about the difficulty.
On this forum at the and there is a post about the development made:
Popesz