It is not required by law to have a witness or notary present at the signing. It is advisable only to the point that you would believe the parties signing would later try to allege they did not sign the agreement. However, their signing of the agreement without a witness or a notary still makes the agreement valid and binding. Videotaping would be excessive, but could be used as evidence if a party claimed they didn't sign. If you are thinking there are going to be problems, then the best way to do this is have it executed in your LLC's attorney's office with the attorney present.
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