Fix deep Scratches on hardwood floor
Those are really deep scratches, you can't fix those completely. You could get rid of the smaller ones and fill up the bigger ones, you'd need to sand the whole floor down and refinish it though or it would look worse. At the end of that it may not look that much better, then the only option is replace the whole floor. 

If it was me I'd invest in a rug which would cover that area, or I'd just live with it.