looks like it's from the movie A World of Glory?
found this which talks about similar scene
https://www.reddit.com/r/tipofmytongue/comments/4abolj/tomt_video_clip_from_a_movie_where_people_are/
[TOMT] [video] Clip from a movie where people are ushered into a truck and killed via carbon monoxide poisoning while a man breaks the fourth wall and stares at..
181 votes, 37 comments. The title basically says it all. Here are some additional details. -I was linked to this film clip through an Askreddit or …
https://www.reddit.com/r/tipofmytongue/comments/4abolj/tomt_video_clip_from_a_movie_where_people_are/