it's being done already. I came across that just yesterday.
At the end of his blog, Andrew Symes shows beautiful Saturn and Mars stacked images from videos.
https://canadianastronomy.wordpress....th-your-phone/
Here's a passionate interview with him:
https://www.awesomeastronomy.com/tut...ith-your-phone
For iPhones in particular, Keith''s Image Stacker does what Linkeos or Registax do for planetary imaging.
http://keithwiley.com/software/keithsImageStacker.shtml
As I understand it, the wonderfully
small pixel size - iPhone 4s and 5 have 1.5 um - is an advantage in
planetary imaging. Advantageous over using DSLR -and since everybody owns a smartphone anyway, it's also a advantageous compared to ZWO cams and such which are very expensive.
The 4s offers no manual control over the camera and a simple moon filter is needed to reduce the brightness of the planet in the video footage.
Newer smartphones than the 4s have manual camera controls and hence can be operated without filter.