Zoom meetings carry HD video, generally both upstream and downstream. You hardly need 1080p 30pfs at a high bitrate to aim through crosshairs. You can totally split the feed to a low-resolution wide field of view (FOV) feed, then crop your feed to a low FOV once the target is acquired to enhanced apparent resolution. Common thermal scope are generally 320×240[0], and that's plenty to hunt at night. Reduce the frame rate to 15fps, and that's 54x less raw bandwidth, without accounting to whatever gains you can gain with H.264. I'd probably implement some sort of variable bitrate, aim to the general target direction with the high FOV low-resolution low-bitrate feed, then zoom to the crosshair section (low FOV, high resolution, even though the "effective" resolution is the same) and higher bitrate.

[0: btw, I'm not not implying a thermal scope was used here, but simply drawing a parallel for comparison with off the shelf commonly used hunting equipment. If 320x240 is enough to kill a coyote at night at 100 yards, it's plenty to target a human. Not to mention full-auto fire will cause recoil and whack your aim, so you're not looking to repeat a 5-shot group within dime either, just shoot in the rough vicinity and spray the target with projectiles.]

Also, the US army (not implying US involvement here) is piloting drone from the other side of the planet, so getting a signal out of a country is not very difficult.