Hmm…
Bearing in mind this is an eleven year old computer. Sorry to say that it probably won't be up to running a lot of current streaming video media. Just not powerful enough. Plus unless you open it up (not advised unless you know what you're doing), you can't easily upgrade the hard drive (it will have max 6GB unless it's been upgraded). TRAM can be taken to 512MB, but would probably cost a fair bit.
It will struggle. Not really worth spending money on these days. Still capable of a few things though, like simple word processing, basic image editing, playing music. Won't have a DVD drive sadly.
I have a slightly younger 2000 iMac, which has a chunk more power and capability. Still being used now, works fine. There was a significant jump from the previous model.