Hello there, If you are talking about a HUD (like the 3 hearts in the video or a score) :
Make a new layer on top of all the others and set it's parallax to 0,0.
Next create all the HUD related things in that layer, in this case I guess it would be the sprites of your buttons.
Finally, select those objects and give them the behaviour "Anchor"
I hope you find this helpful and good luck!
PD: Any HUD related objects must be inside the margins of the window size, otherwise you wont be able to see them!