Select an object. > Modify panel > Modifier List > World-Space Modifiers > Surf Deform Binding (WSM)

Select an object. > Modifiers menu > Animation Modifiers > Surf Deform Binding (WSM)

The SurfDeform (WSM) modifier works the same as the PathDeform (WSM) modifier, except that it uses a NURBS Point or CV surface instead of a curve.