sneak walk and problems need solve it

mental ray render sneak walk, for the next step will render body and shadow only without other things,but i still has problem about Match Mover.

There are serval problems need solve it:

• Baris told me use z depth to render body and  shadow
• before Match Mover, must convert AVI to TGA file,and then take those sequences into match mover
• texture of the eraser

for the texture i want use real material: