Strange changing shape object in summer sky

Was talking to my brother on my mobile in the back garden when i first noticed this in the sky.Recorded this object on the ipad for about 4 mins but very faint due to distance,black object swimming through the sky like a fish, then thought it was a helicopter in trouble heading towards my house ( this is when i got the ipad to record it.) but then it stopped and stayed hovering for about 2 mins changing shape like a bubble of water in space,then slowly moved of and disappeared . The ipad had trouble picking object up due to distance but zoom in and it can be seen faintly in several parts of the film.im on my own at first with a full running commentary then my family come home and witness it.please excuse the odd swear word, but was a bit exited.