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I am an Indian national and would like to ask a question about my travel to New Zealand. My old passport contains my New Zealand visitors visa which is still valid for 8 months. Recently my old passport has expired and I got it replaced with a new passport. I am planning to visit my friends there and just wondering can I just travel New Zealand with visa in my old passport?

You need to transfer your visa in your new passport. From the official New Zealand Immigration :

Transferring my visa to a new passport

"If you have renewed your passport (because it has expired, was
lost/stolen or your name has changed), you need to transfer your valid
visa into your new passport before you use it to travel. This applies
regardless of whether you have a physical visa label or an e-visa or
other label-less visa."

Further from the same website New Zealand Immigration:

Travelling to and arriving in New Zealand

Checking that you are OK to travel to New Zealand:

• make sure your visa is in the passport you use to travel to New Zealand – if you want to use a different passport, you’ll need to make sure you apply to transfer your visa to the right passport before you travel

When you may be prevented from travelling to New Zealand

• Your visa isn’t in the passport you use to travel to New Zealand.

There fore you will need to transfer you visa into your new passport.

Most likely you will have to pay another fee to transfer New Zealand visa into new passport.

Source: Immigration New Zealand