From my understanding (suggest double checking my info to be sure) It is legal to record in NH, prvided at least one of the parties being recorded (this being yourself) is aware of it.
what technically is legal to do vs. what the police arrest and charge you with are completely different animals. In bold; from the definition...it's technically legal to audio record if someone doesn't have the expectation of privacy; holding a video camera up to someone's face and telling them you are audio recording; pretty much negates any expectation that oral communications are not subject to interception....
570-A:1 Definitions. – As used in this chapter:
II. "Oral communication'' means any oral communication uttered by
a person exhibiting an expectation that such communication is not subject to interception under circumstances justifying such expectation.
570-A:2 Interception and Disclosure of Telecommunication or Oral Communications Prohibited. –
I. A person is guilty of a class B felony if, except as otherwise specifically provided in this chapter or without the consent of all parties to the communication, the person:
(a) Wilfully intercepts, endeavors to intercept, or procures any other person to intercept or endeavor to intercept, any telecommunication or oral communication;
(b) Wilfully uses, endeavors to use, or procures any other person to use or endeavor to use any electronic, mechanical, or other device to intercept any oral communication when:
(1) Such device is affixed to, or otherwise transmits a signal through, a wire, cable, or other like connection used in telecommunication, or
(2) Such device transmits communications by radio, or interferes with the transmission of such communication, or
(3) Such use or endeavor to use (A) takes place on premises of any business or other commercial establishment, or (B) obtains or is for the purpose of obtaining information relating to the operations of any business or other commercial establishment; or
(c) Wilfully discloses, or endeavors to disclose, to any other person the contents of any telecommunication or oral communication, knowing or having reason to know that the information was obtained through the interception of a telecommunication or oral communication in violation of this paragraph; or
(d) Willfully uses, or endeavors to use, the contents of any telecommunication or oral communication, knowing or having reason to know that the information was obtained through the interception of a telecommunication or oral communication in violation of this paragraph.
I-a. A person is guilty of a misdemeanor if, except as otherwise specifically provided in this chapter or without consent of all parties to the communication, the person knowingly intercepts a telecommunication or oral communication when the person is a party to the communication or with the prior consent of one of the parties to the communication, but without the approval required by RSA 570-A:2, II(d).