Actually I would think it may, from Wikipedia:
"Pornography (from Greek πόρνη (porni) "prostitute" and γραφή (grafi) "writing") (more informally referred to as porn or porno) is the representation of the human body or sexual activity with the goal of sexual arousal"
So according to this definition if the goal was sexual arousal in your tickling video, it may match the definition.
Was the goal to sexual arouse males/females buyers?, Would the company that made it have intend to make it for the buyers to be sexually aroused? Could tickling between those two female adults, be consider playfull and no sexual or not?
I would consider it porn, soft porn, if you want, but porn neverthless.
I have nothing against porn, the porn and film industry gave a gross income of 60000 million dollars last year in the USA, more than hollywood. Is a great business.