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Is there any package which shows PID of a window by clicking on it?

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Yes. Try xprop and you are looking for the value of _NET_WM_PID:

xprop _NET_WM_PID | cut -d' ' -f3
{click on window}
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Note that this information is provided voluntarily by the client and need not be correct, present or meaningful (remote clients, clients in a separate PID namespace). – Simon Richter Aug 22 '11 at 13:23
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xprop will return a window's PID.

You can filter the verbose output using awk:

xprop | awk '/PID/ {print $3}'
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