Hi,
Im writing this as this is what i wanted 2 do, but didn't have a clue
This works 4 me(But it aint no Gospel) so i hope it helps someone else.

1st i got hold of "Real-Viz Matchmover",imported my video sequence,
Camera Tracked,then exported as a maya(.ma) with scene options selected

2nd i opened scene im Maya,import my camera background sequence
(will be configured automatically by matchmover to run sequence)

3rd imported my model, scaled rotated ect
Moving my model in2 the view of my camera & then attach it to one
of the locators (i attached it to a locator on my X Axis)

4th Delete the background in the camera so as to render out a Alpha channel.
Render.
Once rendered take your sequence (mine was Targa Format) & place in2 (i use) After Effects.
(Premultiplied)Then import your Original background footage.

When rendering out your scene in maya for best quality do not use avi format.

Adios my friends :banana: