nartreb
Speak softly and carry a long lens
I do agree the markings look sparrow-like, but it wouldn't have had any trouble perching if it were a sparrow? It made two attempts within a couple of minutes and then seemingly gave up.
I hope I'm not piling on, but since nobody seems to have replied to this specifically: this clip looks to me like a sparrow (not so big, look at the length head to tail compared to the bird at the top of the feeder) that was startled by the male sparrow at lower right (which may have been hidden behind the feeder, from the flying bird's point of view, or may simply have done something aggressive in bird-speak) and so changed its mind about perching.