Dating is the best way to tame these. The appropriate dress for the occasion is a full suit of Ghille Armor. Pick your ape date up with a Quetz, drop in a taming pen, and hand-feed Mejo Berries. He/she will love you for it!
Build a small pen with a foundation a doorway and 2 walls then get him to chase you into the foundation escape through the doorway and place the last wall behind him then add 4 more walls above then a hatch frame at the top then feed him from above
1. Build a taming pen, 1 foundation 4 door frames
2. Get him in there. (Argi works well)
3. Feed him once.
4. Go do some other stuff (Food will drop now)
5. Come back and feed him crouching trough the door frame. He will not agro.
6. Enjoy your new best friend.