Answer
Yes. Over time, genes leading to a higher resistance against HIV would increase in the population facing high amounts of HIV infections.
Work Step by Step
The survival of people born in areas with high rates of HIV infection would be determined their genes; therefore, those with genes capable of resisting HIV would have a higher probability of surviving, reproducing, and passing on those genes to their offspring. Over time, higher amounts of people with genes resistant to HIV would become evident within the population.