When we speak of in camera sessions, I'll read from Chapter 20 of O'Brien and Bosc, page 1077:
Neither the public nor the media is permitted at in camera meetings, and there is no broadcasting of the proceedings. Usually, only the committee members, the committee staff and invited witnesses, if any, attend in camera meetings. Members of the House who are not members of the committee normally withdraw when the committee is meeting in camera. However, the committee may allow them to remain in the meeting room, just as it may allow any other individual to remain.