In your MM software, after your solve is created, add what your chosen software calls a "Feature Point".
Some software such as PFTrack/Boujou/3D Equalizer call it names like "Feature Point" "Feature Track", etc.
This is basically a point in 3D space matching your chosen feature(s) on your footage that when brought into Maya, is converted into a Locator matching your original footage in 3D space.
Then, simply parent your hair or objects to that locator, and it will follow along with it
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS