• Maya Settings (Arnold): Under RenderSettings → Arnold Renderer (Tab) → Motion Blur → Checkboxes (Enable + Instantaneous Shutter)
• Maya AOV: motionvector
• Nuke Node: VectorBlur-Node

• Maya AOV: depth
• Nuke Node: Bokeh, zdefocus is not working that great with depth mattes without aliasing

• Maya: Done by an extra Render-Layer with material/shader override for all geometries. Use an aiUtility node as shader in Maya and set it to UV.
• Nuke: STMap for remapping an source image as texture

Maya: P as position point pass Nuke: There is a Gizmo called PPMask that allows volume selections based on a coordinate of the P-Pass, around which a volume can be spread.