Some time ago i posted how you can connect to a spine or leaf switch -> Connect to a leaf/spine switch
With the introduction of NX-OS, the syntax changed a bit. You have now first to drop back to the bash shell and then you can attach the switches. Password is still the same as for the APIC.

apic1# bash
admin@apic1:~> attach leaf01
This command is being deprecated on APIC controller, please use NXOS-style equivalent command
# Executing command: ssh leaf01 -b 10.127.240.1

Password:
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
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Lesser General Public License (LGPL) Version 2.1. A copy of each
such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
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leaf01#

There is also the possibility to directly run show commands from the APIC.
Run Commands on the Fabric Switches from your APIC