The Core i7 8700K is going to be the best gaming CPU you can get and a really great editing CPU. I would personally opt for the 8700K but there are better video editing options available on the X299 platform starting with the Core i7 7820X but that may be a bit more than you wanted to spend on just a CPU. It costs $200 more for those 2 extra cores but if you're going it be doing a lot of rendering it might be worth it.
TY so much for your answer! I think i should stick with 8700k now and make up my mind on how to cool that piece of amazing hardware during a moderate OC.