I've had a birdbox with a video camera in it stuck to the side of my house for a decade. It's been occupied every year since, but is a bit rotten. So I splashed out on a new one, this time HD camera, with infrared for viewing at night, and a side-on rather than top-down view.
On Saturday a blue tit came in, had a look round, brought some twigs and leaves and pushed them around a bit. So hopefully soon there'll be a nest and then some eggs and then some blue tit chicks.
And this makes me happy.