From this video, the kitten’s breathing looks calm and unlabored. I do not see open-mouth breathing, obvious belly heaving, chest sucking in, neck stretching, or blue/gray gums. Those are reassuring signs.

A video cannot reliably measure the breathing rate, so check while the kitten is asleep or very relaxed: count each chest rise for 30 seconds and multiply by 2. A relaxed cat is commonly around 20 to 30 breaths per minute; a persistently fast rate or visible effort needs veterinary advice. Cat breathing warning signs

Go to an emergency vet now if there is open-mouth breathing at rest, gasping, noisy breathing, pronounced abdominal effort, blue/pale gums, collapse, or marked lethargy.