Harper Collins German Unabridged Dictionary:
film over or up vi (mirror, glass) anlaufen
Oxford Duden German Dictionary:
film over v.i. <Spiegel, Glas:> anlaufen;
her eyes filmed over with tears Tränen traten ihr in die Augen
Spears, NTC's Dictionary of Phrasal Verbs and Other Idiomatic Verbal Phrases:
film over [for something] to develop a film on its surface
 The windows had filmed over because of all the cigarette smoke
 Her eyes filmed over with the cold
Cambridge International Dictionary of Phrasal Verbs
film over films, filming, filmed
if a surface that you can normally see through films over, it becomes covered with a thin layer of something and becomes difficult to see through (often + with).
His eyes filmed over with tears when he heard the newshttp://encarta.msn.com/encnet/features/dictio...
become covered with a thin layer: to become covered with a thin or misty layer of somethinghttp://www.popularmechanics.com/automotive/su...
He said that no matter how hot he made the heater blow on the windshield, the window still remained filmed over with condensation.http://www.everythingisdumb.com/032404.html
Refusing to clean, his windows filmed over with what looked like a thin coca-cola veneer but was probably a mix of cooking, smoking and sweat.http://www.usaaf.net/moh/a_m/michael.htm
Hydraulic fluid filmed over the windshield making visibility impossible, and smoke filled the cockpit.http://www.comrade.org.uk/oct2002/poetry5.htm
the windows filmed over with frost