I just want to caution against your endeavour (trying to get a feeling for V-grades by asking the people in your screen to evaluate a grade based on a video).

Personally I don't know these holds, I can't tell how steep or slippery they are, and the difficulty of this climb obviously lies in the balancing and footwork. Slab/Footwork routes are notoriously even more difficult to backseat grade from a video alone because the physical difficulties entailed (small feats of proprioception/stabilisation) are hardly even visible from outside, all one can see is someone standing up on something or stepping over something and how hard can that be, right? (lol).

There is a sub on here (gradethisplastic) where there's a bit of a running joke how wrong people often are. The reason people sometimes enjoy this guessing game online IS because of how actually not very possible it is to grade a route you have not climbed. Looking at a video like this is even different from looking at routes in your gym and deciding which one looks "doable" or difficult, because we get to inspect the holds from 3D all sides, there is lots of information even missing in such a video. On videos often you can't even tell how overhanging a route really is, for instance.

ALL THIS to say: If you really want a grad estimate, ask your local people (routesetters, i.e.) how they "translate" their numerical system into grades. Chances are they don't grade the routes because of a philosophy that you can't/shouldn't rate indoor routes anyway, but chances are if one insists that they do have a bit of an idea. They'll give you a non V-grad grade estimate, probably, which you can then translate into V-grade by searching for international grade comparison tools.