I tested that and I only needed to enable video on CUCM just like any other video capable endpoint. I never enabled anything on the CIUS to get that working.
I'd recommend you to check your regions, maybe you're blocking it there.
What CUCM version and FW on CIUS?
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate