Isn't the exact same light affecting the cup whether I am gazing at it or not??? So my gazing shouldn't affect it, right?
But just like I said above the lighting was not changed from before observation to while observing. So the observing shouldn't affect anything. But it does in the case of the electrons? Why is the mysterious question.
Wrong. To observe, you need the light on.
If the light is on, whether or not you observe it, there is no interference pattern.
If the light is off, whether or not you are watching, there is one.
Your video got this badly wrong.