Manipulate[HighlightImage[images[[frame]],Take[features[[frame]],UpTo[n]]],{frame,1,Length[images],1,Appearance->"Labeled"},
{{n,15},5,50,5,Appearance->"Labeled"},
Initialization:>{images=ExampleData/@(ExampleData[{"TestAnimation","ChemicalPlantClose"},"Frames"]),features=ImageFeatureTrack[images]}]