I have played without killstreaks many times I pretty much always go knife only and have gotten over a 25 killstreak many times. These vids are very possibly true if I had a recorder I would make some vids like these but I use pretty much the same tactics and it is very fun. I don't know if these vids are real or not people seem to stand still alot but I'm just saying it is possible to do this as I have or could have I don't use killstreaks(including nuke) alot they seem to slow me down and I always seem to die right after I use them for some reason..... plus I don't like the way the game ends early I like to get as many kills as possible

.
also for anyone looking at the tips in these vids these are 3 of the best maps to knife on in my opinion people seem to move in groups alot and they are easy to get behind. Skidrow being my favorite with my best match being I believe I was 79 and 10.