Time-lapse video can be a wonderful addition to real estate video where you want to dramatize any kind of view. Rather than using straight video or a still image on the screen for several seconds a time-lapse with rolling clouds give an elegant dramatic look.
Creating time-lapse video is pretty easy. You basically shoot a series of frames on a tripod with a remote controller every 2 to 10 seconds. I use either a CamRanger or a TC-80N3. You can then import the resulting stills into Lightroom, do adjustments and then use the Lightroom Slideshow feature to write a video file.
To get high quality time-lapse video, without flicker you need to pay attention to a lot of other details. Here are some great resources to help you get through those details:
I have a copy of all 4 of these. I recommend them highly. Back in September of last year, the last time I did a post on time-lapses one the commenters pointed out Gunther Wegner's products (1, 2 & 3). Gunther's LRTimelapse along with Lightroom has become a standard creating time-lapse video.