This is one of the source vids
Note that you need both the hand claws and the foot spikes. If you search "ninja climbing spikes" on youtube you'll find a lot of people trying to climb a tree with only the hand claws and they all fail.
Here's another video where someone uses both the claws and foot spikes.
The guy in the first video says climbing with the claws is painful and it doesn't work with every kind of tree.