A Brooklyn man who was arrested on Sunday on a variety of charges accused the police on Thursday of beating him in the entryway of his building without provocation while shouting antigay slurs.

The man, Jabbar Campbell, 32, held a news conference on Thursday at which he showed videotaped images captured by security cameras that he had installed inside his apartment and in front of his building as a deterrent to thieves.

The videos did not show any beating. But one camera, aimed at the building’s front stoop, showed a police sergeant reaching up and turning it around, toward a wall. A second set of images, recorded several minutes later, showed several police officers walking through Mr. Campbell’s apartment, on the second floor of the building; Mr. Campbell and his lawyer, Herbert S. Subin, accused the officers of conducting an illegal search without a warrant.