I came across this recent video from wanzamhobby Drone, titled "DRONE registra 3 OVINIs sem QUERER na SERRA" (which roughly translates to "DRONE accidentally records 3 UFOs in the mountains".

This is the location of the footage:
https://maps.app.goo.gl/R4MUk7Q7juXJqFvw5

Frankly, it appears to be specs of dust, pollen, and even insects that are moving fast due to parallax.
But I Thought it would be in good tone to post it here

wanzamhobby Drone:
https://www.youtube.com/@wanzamhobby

"DRONE registra 3 OVINIs sem QUERER na SERRA"

The author's further 'investigations'

Maybe ballooning spiders?
But there's a weird bit where it seems to disappear without breaking the dark line of the road (at another point it clearly does pass over the road), so maybe just a video issue.