The only explanation I could think of is a flying insect very close to the camera, but it appears to move behind the rocket.
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In the video I’m watching the bird flies off frame to the left.
Something come in from the right at a pretty significant speed. It crosses above the rocket and goes off to the left. This ALL happens during 1:11:00. The “bird” is seen crossing the entire field of view in a second.
The “bird my have either been on the lens t give the appearance of moving fast, or it was the fastest crow ever in Florida.
I don’t know what it is. It is just not a bird.