Самый простой способ - использовать UserDefaults
.
// GameViewController or MainScene
// when you start the game set the value to 0
UserDefaults.standard.set(0, forKey: "numberOfTries")
// GameScene
// before transitioning to the new scene, increment the value by 1 and save it
var numberOfTries = UserDefaults.standard.integer(forKey: "numberOfTries")
numberOfTries += 1
UserDefaults.standard.set(numberOfTries, forKey: "numberOfTries")
// MenuScene
// get the value and compare it, if it reached the try limit, show video and reset the value
var numberOfTries = UserDefaults.standard.integer(forKey: "numberOfTries")
if numberOfTries == maxNumberOfTriesBeforeVideo {
// show video
numberOfTries = 0
UserDefaults.standard.set(numberOfTries, forKey: "numberOfTries")
}