I have a AMD A10-6800K 4.1GhZ CPU and I'm planning to buy GTX 1050 since it's good for my budget, so Is there going to be a huge bottleneck ? Just want to play games like CSGO, Overwatch etc.
Right. There will always be a bottleneck. Sometimes it's the CPU. Sometimes it's the GPU. More likely it will often-times be the A10-6800K holding back the 1050, but not enough to keep you from getting your money out of the 1050.
Both your processor (likely beaten by an i3-6100 in gaming benchmarks) and GPU are relatively slow, so, I'd say there is no bottleneck in favor of one over the other. If it is gaming that you are interested in, get a better GPU foremost...
The GTX 1050 is a good pair with your CPU. It would be a great choice if it is good for your budget. Anything more than that and you might see too much bottlenecking to make it worth your money.
Right. There will always be a bottleneck. Sometimes it's the CPU. Sometimes it's the GPU. More likely it will often-times be the A10-6800K holding back the 1050, but not enough to keep you from getting your money out of the 1050.