Yeah the satellite wouldn't stay in orbit :) But ignoring that...
Time dilation comes into play at relativistic speeds. The faster you go, the slower time goes. As such an astronaut on the IIS will age a tiny bit slower than someone on Earth.
So for your example, time on the satellite will appear to slow down as observed by someone on Earth. This means that say for 1 second passing on a clock on the satellite, 2 seconds pass on a clock on Earth. Let's say the camera is recording at 30 FPS (satellite time) but that means it's only taking 15 frames for every second that passes on Earth. That means 2 seconds of Earth time are compressed into 1 on the satellites camera and it records things as if they are moving twice as fast.
Sending the signal back to Earth will cause some difficulties. Assuming a stationary position on Earth then the satellite will be whizzing towards you (at relativistic speeds) then past overhead and away. This will lead to some red/blue shift of the signal as well as the fact that the signal timing will be out but assuming we can correct for these effects then people on Earth will receive a video that appears much sped up.