I am not sure I understand though I imagine you would like to zoom and move around the SVG. TBVSVGViewer provides only basic placement/stretching.
For this, you need to use for example a TBGRAVirtualScreen and draw the SVG the way you want in it. There are various drawing functions that take coordinates and zoom level.
The AutoSize property may need some fix, because in theory, the SVG would then be the size according to some default DPI.