For intellisnap in VMaware, from where can I get the ESX proxy features to perform the snap? Specifically when I configure in this part Access Node ESX Server.

I`m not sure what you mean by features. Here are some reading related to SAN Transport mode and sizing. 

VMware Building Block Guide - Virtual Server Agent for VMware

https://documentation.commvault.com/11.24/expert/32799_vmware_building_block_guide_virtual_server_agent_for_vmware.html

ESX Proxy Sizing (SAN Only)

https://documentation.commvault.com/11.24/expert/32875_esx_proxy_sizing_san_only.html

SAN Transport for VMware

https://documentation.commvault.com/11.24/expert/32040_san_transport_for_vmware.html

If you still have questions, please share a little more details as to what your goal is.

Thanks

To see any of the IntelliSnap options, you must enable IntelliSnap on the properties of the virtual client - then there will be IntelliSnap options at the client level. Once configured when you run a backup it will be a snap backup. You can copy the contents of the snapshot to your library using the backup copy option on the storage policy copy (similar to auxiliary copy but for snap jobs only).

I hope that answers your question but perhaps I misunderstood it!

Thank you all for your answers, what I wanted was this: ESX Proxy Sizing (SAN Only)