Core Media Examples?

I'm trying to process H.264 video from a raw UDP stream.
I have working swift code, however I am trying to use xamarin... there is no documentation, no examples, and I'm nearing my limit of banging my head against brick walls...
Does anybody know of any examples or further documentation on this, for example getting CMFormatDescription using FromH264ParameterSets, does it include the NAL header or not etc etc etc.....
Why is there not definition for CMSampleBuffer.Create..... the closest I can find is CMBlockBuffer.FromMemoryBlock, which is not the same underlying function....