Not seagulls. This view is from downtown looking into the southwest sky. The lake is east.
Sunrise in Milwaukee on 28 Feb was 6:29 a.m. CST. The video is from 4:43 a.m. Astrofags would have to explain how high up something would have to be to reflect sun light at that time.
The lights appear to be over the suburbs of West Milwaukee and West Allis. These are blue collar areas. Most interesting things in that area are Miller Park (MLB stadium) and the Zablocki VA hospital. The Wisconsin Air National Guard 128th air refueling wing is located 6 miles directly south of the camera… not in field of view.