Mimic: Sentinel (2003)

In a decaying neighborhood, asthmatic and allergic amateur photographer Marvin Montrose spends his days and nights confined in his room, snooping on his neighbors in the next building with his camera. When a boy disappears in the spot and then the local drug dealer Desmond, Marvin suspects a mysterious garbage man and his sister Rosy and her friend Carmen investigate. Meanwhile, Marvin witnesses the death of Detective Gary Dumars and a stranger on the street by two mutant Judas Breed insects and discloses that their prime suspect is the CDC Agent Kirchner.