Assimilate

Assimilate is a 2019 American science fiction horror film directed by John Murlowski and starring Joel Courtney, Andi Matichak, and Calum Worthy also with Mason McNulty and Cam Gigandet.

Zach is in love with a girl named Kayla, a lacrosse player over at the local high school, but she only regards him as a friend, she is concerned over soon having to study overseas as it means leaving her younger brother Joey since their parents don't have any time for him.

During the day, Zach and Randy meet a neighbor, Ms. Bisette, who is concerned about a strange bug moving in an unnatural, synchronized pattern on her apples.

Zach and Randy begin to see disturbing events unfold the next day, with the pastor and sheriff acting emotionless.

In the ensuing chaos, Haywood is dragged out of the window and killed, and Randy leads the assimilated away as a distraction while Zach and Kayla run.

Zach and Kayla fend off their clones by flooding the room with carbon dioxide (distracting them with images on the monitors), suffocating them, and they are able to upload the vlog onto YouTube.

In a reveal through TV displays, Zach and Kayla watch in horror as feeds from Washington, D.C., Beijing, Agra, Paris, London, New York and Tokyo show copies burning the corpses of dead humans and walking in the same emotionless state as previously seen.

The final scene shows the YouTube video comment section, where it's revealed that multiple people are still alive in different cities of the world, specifically Boston, Nanjing and Prague.