The Metadata of the Nano GigE Series are included into the image as “GenICam Chunk Data”. Those data do not overwrite the image data (as we discussed for the Linea camera). However they are send with each image and you are able to access them via software.
Currently I do not know if we have a sample code for the Nano but @parsd already answered on a similar question regarding a AT C5 camera:
https://forum.commonvisionblox.com/t/using-chunk-mode-data-with-cvb-net/333
@M_M, do you have some sample code to receive ChunkData from the Nano? 