TEPCO's live cam of Fukushima I Nuclear Power Plant is set up near the Seismic Isolation Building near the Reactor 1 building, looking toward the Reactor 4 building and the Common Spent Fuel Pool (i.e. looking southeast).
The worker who's been tweeting from the plant since March 2011 says in one of his tweets yesterday (about how decisions are made on project costs, etc) that there is another camera from the direction of Reactor 4:
In fact, there is a camera right now from the Reactor 4 side. There is a camera on the upper part of the [exhaust] stack on the south side of Reactor 4, and we've been looking [at the images from that camera].
His tweet is in response to a comment about a talk of moving the live cam to a different location, possibly to the Reactor 4 side.
I think he said last year (fairly early in the crisis) that there were many monitoring cameras throughout the plant but TEPCO didn't talk about them. TEPCO's spokesman Matsumoto admitted to the existence of such cameras in a press conference several month ago (I think), and said he would look into it. (He must be still looking into it.)
The worker also alleges that the fabric cover over the Reactor 1 building is only cosmetic, and nothing to do with preventing the radioactive materials from escaping. There was a talk, presumably from the contractors, to build a more permanent structure (more like the one they are building for Reactor 4) but that was shot down by TEPCO over the cost concerns. They wanted the badly damaged Reactor 1 building out of sight of the live cam, he says.