Not good to put acrylic over oil, but if you don't seal the sanded canvas with something the fresh oils will soak into the canvas and bleed. The soaked spots will remain dull. I haven't watched the video but the best way to patch a hole is glue a canvas scrap to the back side.
I thought I was finished with Christmas commissions but lo and behold, I've done another. Here's hoping someone else doesn't come sliding in sideways with another last minute one. Anyway, this is 11X14 graphite.