Teamwork + Explosives is the camp spot breaking formula.
Standard frag grenades have really nasty damage (750 max) and a very generous radius. Consider switching away from concs if you need a ...wider? edge, or have one of your teammates equip the OPGL and make it rain.
Assuming your throwing arm is good, they're either going to take an awful lot of damage, which puts them in a bad situation if you're preparing to push, or they will have to fall back and relocate, giving you ample opportunity to shoot them in the back or to push up to the spot
Some more exposed camping spots can be "broken" with the Volcano (damage and radius ramps up as it travels) and the DMR (2 shot kill past 88m)
Naturally, none of the above matters without teamwork.
Pushing on your own is only so effective if they're prepared for it and have two people ready to gun you down. Ideally, as you damage them and push them back to a bad location, you want someone to either be ready to run in as you chuck grenades, or perhaps a friend with a more accurate weapon ready to pick them off if they start running away
This is especially true for places like the high school where you get clear LoS to the spot in question. Have the pointman ready to climb the stairs as your Marksman/Sniper harasses them & another person tries to chuck grenades to flush them out.
Another example where good teamwork is required would be the nook above Double B.
Ideally you should be able to push them towards either the ladder or the balcony with explosives from one side, blasting the other side with more explosives to trap them & weaken them enough for a push. Make sure to have a buddy watching the ladders if you're coming in from the street door, however