I thought that this only worked on the HTC one X and Evo 4g lte , but if you are video recording on the nexus and tap the screen it will shoot a picture while video recording.. awesome
I have my Motorola xoom with ICS I haven't tried it yet I'll do it tomorrow
I do not think it was an ICS thing but more a Galaxy Nexus thing. I think the camera or drivers are something that needs to support this. Don't think it is related to the OS only.
You can let us know your outcome though...