UFO as a cloud spotted in San Jose, California

On December 4, 2015, a parent was picking up his child in Norwood Creek Elementary School (in San Jose, California). On the spot, the witness has spotted a UFO looking like a cloud...

Witness statement:

I was picking up my child from school and noticed an object the same color as clouds moving. I didnt notice anything strange until i realized that there were no clouds and the skies were clear. I witnessed the object for a few minutes. A tree obstructed my view so i stood up from the bench i was sitting on and it was gone. At first it appeared to be a parachute but there was nobody on it. Not sure what it was.