So, do you confirm that I do not need any other "element" between my detector and the cd4067 to be able to use that signal
Yes it looks like it. The CD4067 is an analogue multiplexer, this means that it will switch any voltage between ground and the power rail, in this case 5V. So if your sensor produces 5V or less it can go through this chip.
It is not even necessary to remove the LED, the voltage of about 2V across the LED will be transferred through the chip.
If however your sensor returns a 12V signal then you will have to cut this down to 5V or below before passing it to this chip. You do this with two resistors connected as a potential divider.