Thanksfor your reply
It would work with two gears no question
But like shown
First theres the planetary gear at the bottom.
Then the long poles to make the gear turn.
Then the pole in the sun gear to complete the rotation
If it was one gear when the one gear cleared the bottom gear it would get locked unless it fully cleared the bottom gear and to make a rotation after it fully cleared would take 270 degrees which is equal to two a full circle
And a full circle is the same as two gears

It there was a way ( which there isn't )
To make it so a 180 degree turn in one tooth then it could a turn but it needs 90 degree to make a turn or it will.take two gears

So in short it needs two gears

And the YouTube is for a different application

If you want.to make a two gear system

I am looking for a developer

Thanks for your reply