Sure! Animation Paper has build-in reference layers! This is exactly what is needed for rotoscoping.
You make sure to have your video material saved out as a framestack of png images (soon Animation Paper will accept video files as well, but for now you’ll need a sequence of png’s).
When you import your reference (rotoscope) material into Animation Paper (select 1st png and shift-select last png to have all of them imported), it automatically adds a reference layer with your video material. You can then adjust the opacity of your ref-layer to your liking – and add normal layers on top for your rotoscope drawings.
Let me know if you have further questions!