Help Is it possible to implement a feature like in the video with Obi Rope?

[chenji]

If this feature is used by monsters and there are dozens of monsters on screen, will performance issues be manageable?
Also, could you provide me with a sample project that demonstrates this functionality?

Firstly you're able to disable the script of the monster (or Obi solver) that is invisible on camera to increase performance.
Secondly you don't need add multiple Obi ropes for every arm for monsters. Just use animation is fine since player will not see the difference. So at most 1 Obi Rope for one monster is enough, which is used to attack/interact with user.
You only need more Obi ropes for those that can be clearly seen (in most cases controlled by the player) by the game player.