We had the Blue Tits (both) visiting the box a number of times during the morning.
Unfortunately, I was leaning out of the window trying to attract a Wren that I'd seen, with my Wren Call, so didn't actually manage to record any footage of any bird IN the box.
The only clip I did get was of a flickering shadow inside the box as one of the birds poked its head inside and peeped with its eyes, as well as its voicebox(es).
Turn the music off at the bottom of the home page of BG, and press play (twice) on this first clip. Even if it looks like there is no clip to play (ie a dark space above the play button). If your computer is set up to play clips, play it will, for 4 seconds.
You'll see the shadow, you'll hear the Blue Tit.
Remember, the camera is in the middle of the roof, facing directly down into the inside of the box - the opening hole for the birds is effectively out of shot, at the top of the image.
Our first Blue Tit video. 4 seconds long. Of a Shadow, and a few squeaks. They WILL get better - I promise!