Orbs (UFO) on Blue Sky and Clouds

I took this lengthy video last summer, using my iPhone. I laid the phone on an angle, pointing out my window and up into the blue sky. Later I set the video to music and made a relaxing mashup. However I noticed a white orb/ufo in the video at about 4:16. It is quite remarkable. I also saw more orbs elsewhere in the video, such as at 9:09 but the one at 4:16 is the best one. I checked the original video and the white orb is also on the original.