I would add a couple of tips:
1- have some black crosses on the white card to help with tracking (4- one in each corner for a corner pin track in Mocha). Even if Mocha should be able to handle the blank white board this can only make it better.
2- For framing purposes put a transparent plastic sheet taped over the preview monitor in your shoot and draw with a Sharpie the position of the first person holding the card. This should help keep the card in the same spot - if that's what you're after.
For tracking the markers in the corner make sense. But if (like in the example you gave) the lighting on the paper is going to change each frame, the painting out of the markers may not be a trivial undertaking. If it were me, I'd probably shoot this without markers.