im looking for a AR app that let me fade a preselected picture or video with different degrees of transparency. I'll explain. Sometimes would be useful to have a superimposition of the picture of an assembled electronic circuitboard while reassembling it after servicing it, for example, as a reference "map". Obviously it would be useful only if there was an easy way to change transparency on demand. Or even playing an instructional video "in background " while following procedure. I don't know if any app in commerce that meet this description. Anyone have a direction to point me to? Much appreciated!