Technically If you want to use NIOC v2, you need to have DVS 5.5 at the maximum. With 6.0 DVS , NIOC 3 is the used. 6.7 does not support 5.5 so I believe NIOC theoretically should not be compatible. However I do not have documentation inhand to confirm.
This doc is for 6.0 About vSphere Network I/O Control Version 3 and 6.7 it does not talk abt the NIOC v2 ...
Thanks,
MS