I don't know about Apple motion2, but in Vue, motion blur can be achieved 2 ways: one is raytraced motion blur, that takes very long to render and needs a lot, a lot of anti aliasing, bit is 100% accurate.  The other way is hybrid motion blur, it's less accurate, but a lot faster and doesn't need extra AA ,it's a post effect that can be network rendered for animations. You can use multipass render in Infinite, which means you can render a mask for the object that has motion, and use this mask to apply the effect in ,say,  Photoshop.