The Enhancer for YouTube extension does this for ads, hence it's conceivable that you could do the same. The problem is that someone who cared enough about this

The Enhancer for YouTube extension does this for ads, hence it's conceivable that you could do the same. The problem is that someone who cared enough about this would have to go through and watch this with the parts they hate still in. Good luck solving that part of the problem :D