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This question already has an answer here:

If you have the wpa2 network key/password how difficult/time-consuming is it to decrypt the trrafic.

marked as duplicate by Bob Brown, WhiteWinterWolf, Neil Smithline, John Deters, Stephane Dec 28 '15 at 7:02

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It is very simple wireshark has a feature were you select a packet dump. You can then enter a wpa-psk key the second you enter that all data will be decrypted in packet capture.

Reference/Tutorial: https://wiki.wireshark.org/HowToDecrypt802.11

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    This is not exactly true. It works only this way when it comes to WEP but in WPA2 the traffice is encrypted with a session specific key that is exchanged in the process of the handshake. Because of that you can only decrypt the traffic of the clients their handshake you captured too... – davidb Dec 27 '15 at 11:15

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