I saw a reaction by chemicalforce on YouTube where he decomposed H2O2$\ce{H2O2}$ into H2O$\ce{H2O}$ and O2$\ce{O2}$ using Potassiumpotassium permanganate. The permanganate is a catalyst in the reaction.
I am wondering if this decomposition occurs because the initial H2O2$\ce{H2O2}$ decomposition reacts with the Kmno4$\ce{KMnO4}$ and reproduces H2O2$\ce{H2O2}$ which then again decomposes?
How is the permanganate a catalyst?