So, how much poverty is there in Bangalore? A hard quastion, because there are different ways to describe poverty. Say, we take German standards. Then most people here in Bangalore probably are very poor and could by far not survive in Germany with their income.
On the other hand, the same income is rather medium in India, and they can in fact live here (and do so :)). There are few people who live on the street as such. Many people live in small huts, three walls built onto an exisiting wall, and plastic as a roof. This is very common on building sites, as these are the places where the workers sleep. I think this are mainly workers from outside Bangalore, who are here for a job.