Is a wife's refusal to engage in video calls with her traveling husband considered a violation of his legitimate marital rights for which she would be held accountable?

The basic principle is that a wife should obey her husband regarding his desire to see her via camera. However, if there is a concern about potential harm, such as the device being hacked, then she is not blameworthy for refusing. There should be dialogue and understanding between the spouses, and they both should be careful that this does not become a source of disagreement.