[MWilson]

Quick testing showed that this helped on a 720x480 version of your video. (My netbook won't run 4k ) You may have to modify it a bit.

v=AVISource("F:\Drone OV.avi").converttoyv12()

v.autolevels(12)
a=last


b=a.gaussresize(width(v)/8,height(v)/8).gblur(2).gaussresize(width(a),height(a))

y1=overlay(a,b,mode="subtract")
y2=b.interframe("Faster","Smooth",60000,1001,cores=1).selectevery(4,0,3).temporalsoften(10,25,25,0).gblur(2)
y3=merge(y1.temporalsoften(8,25,25,0),y1,.25)
merge(y2,y3)
temporalsoften(10,20,20,0)
y4=last
return y4.f3kdb()

Here's the (new) result:https://drive.google.com/open?id=0B7...UpCOE45YjlxaXc

Edit: Link Updated
Edit: Should allow more detail through.
Edit: Added link to new video.