Although not having a front-window passenger accessible window, R68-type rolling stock have a cabin door with a window that gives away the front window.
The video starts shortly after leaving Canal Street, the last stop in Manhattan for a Brooklyn-bound Q train (0:00). It then passes an R46 Queens-bound N train (0:44) right before elevating on the Manhattan Bridge. After going over the East River and just arriving in Brooklyn, the train is met with another R46 N train, this time clearer to see (3:06). Then it goes back underground (4:35) and after a series of turns, arrives at DeKalb Avenue (7:01). It comes to a halt later on (7:39) and goes into motion again (8:07). It takes a sharp turn followed by the train propagating through many minor twists, all before reaching Atlantic Avenue - Barclays center (10:18). The train stays straight while running under Flatbush Avenue for the rest of the video. The train arrives at the 7th Avenue station (12:38) and the final halt occurs at 13:07 which concludes the video.
Recorded using an iPhone 11. This video was upscaled from 1080p30fps to 4k60fps using Adobe After Effects. The final file size was just shy of 6.3 GB.