
filmen
to film
To record moving images with a camera in order to create a film.
Sie hat den gesamten Urlaub mit ihrem neuen Smartphone gefilmt.
She filmed the entire vacation with her new smartphone.
to film
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to film
To record moving images with a camera in order to create a film.
Sie hat den gesamten Urlaub mit ihrem neuen Smartphone gefilmt.
She filmed the entire vacation with her new smartphone.
The verb 'filmen' (to film) is derived directly from the noun 'der Film' (the film/movie). This structure, in which a noun becomes a verb, is very common in German.
Für ihr Schulprojekt will sie einen kurzen Film drehen und alles selbst filmen.
For her school project, she wants to shoot a short film and film everything herself.
'Filmen' is a transitive verb and almost always needs an accusative object. You ask: Wen oder was filmst du? (Whom or what are you filming?)
Der Tourist filmte die beeindruckende Architektur der alten Kirche.
The tourist filmed the impressive architecture of the old church.
'Filmen' is often used with a preposition that describes the device, for example 'mit dem Handy filmen' (to film with a mobile phone) or 'mit einer Drohne filmen' (to film with a drone).
Er filmt seine Reisen immer mit einer professionellen Kamera.
He always films his travels with a professional camera.
to record / take in
Aufnehmen is the more general expression for technically capturing sound or images. Filmen specifically means recording moving images with a camera. For an audio-only recording, only aufnehmen is appropriate; for a video, both are possible, but filmen is more precise.

Beim Konzert filme ich die Band mit meiner Kamera.
I'm filming the band at the concert with my camera.
Beim Konzert nehme ich den Ton mit einem Audiogerät auf.
I'm recording the sound at the concert with an audio recorder.