In reply to Lubo: My set up for filming is as follows -
Rigged static line (i mostly use a 100m rope doubled over to create the two lines) (one working line, one back up).
For ascending a combination of either -
One ascender with a foot loop/ daisy + Petzl Rig (bigger version of the GriGri)
Ascender with foot loop + chest croll
Two conventional ascenders (both with foot loops and daisys)
For the back up line I use a Petzl ASAP (which ascends and descends without any need to interact with the device)
Harness wise I use one of the Petzl full body harnesses (Avao i think it is) with an integrated chest croll, which i find suits me really well, although I also use a conventional climbing harness from time to time when the location for filming has a particularly long walk in etc
Definitely get a belay seat otherwise you won't be able to walk afterwards (I rig this to the handled ascender i'm using).
Other than that I also use a mini traxion and a handled ascender for hauling gear up to me, and have a conventional set of climbing protection for building anchors.
The combination of ascender and rig is the most flexible in terms of being able to switch between ascent and descent quickly but is also the most knackering as a lot more weight is on your arms. The combination of chest croll and ascender is my preferred method as it takes barely any effort (it's all in the legs). If you're serious about getting into filming or photography i'd definitely recommend getting a Rig over a GriGri as you can lock the handle whilst not moving to avoid accidental unlocking, being bigger also makes it much easier to handle.