Image Offset to re-time video Reference like in Maya.

I thought Offset was the same but clearly it's not, it only offsets the start of a video or something, the Curve always in stepped and you can't speed or slow down videos with the F-Curve like in Maya, it's used a lot for Animation instead of doing it in an external Video Editor but you'll lose control of adjusting the F-Curve as you need.

Maya

Blender