editing – Using ffmpeg to edit a simple two camera video

I shot an interview using two cameras: one on the interviewer and the other on the interviewee. I also have two separate audio files, each person had a lapel microphone.
Now I want to edit it into a single video, where I switch between the two input videos such that it always shows the person talking (i.e. a normal, simple interview).

The videos are very long (1 hour each, HD quality). Unfortunately, my computer isn’t fit for video editing (when I use even a simple video editing software my computer gets incredibly hot very fast). I thought to maybe use ffmpeg: I’ll make a list of time stamps where the videos should switch (i.e. when a person starts talking), and somehow input that into ffmpeg to perform the switching. That way I won’t need to have the entire videos + sound loaded into memory. Is such a thing even possible? Am I just pushing the CPU-intensive part to the rendering part?