This
let playMy = true; // false respectively
function togglePlay() {
if (playMy) {
ps5video.pause();
playMy = false;
} else {
ps5video.loop();
playMy = true;
}
}
and register the function in setup()
ps5video.mouseClicked(togglePlay);
(you can say ps5video.pause() or ps5video.loop in setup() afaik; set flag playMy accordingly initially)