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for this demo I used 3.3v as power source for the receiver but in real life it will probably be a 5v power source so you'll need to figure a way how to do it (resistors, level converter...) 

and of course the code :)

/* build and tested using
sony camera block fcb-ex11d and
rc transmitter spektrum dx6i with
ar6200 reciever and connected to the elev channel */
byte address_set[4]= {0x88, 0x30, 0x01, 0xFF};
byte if_clear[5]= {0x88, 0x01, 0x00, 0x01, 0xFF};
byte command_cancel[3]= {0x81,0x21,0xFF};
byte zoom_teleVar[6]= {0x81, 0x01, 0x04, 0x07, 0x23, 0xFF}; //zoom in 81 01 04 07 2p FF - p=0 (low) to 7 (high)
byte zoom_wideVar[6]= {0x81, 0x01, 0x04, 0x07, 0x33, 0xFF}; //zoom out 81 01 04 07 3p FF - p=0 (low) to 7 (high)
byte zoom_stop[6]= {0x81, 0x01, 0x04, 0x07, 0x00, 0xFF}; //stop zoom
byte auto_focus[6]= {0x81, 0x01, 0x04, 0x38, 0x02, 0xFF}; //auto focus

const int thisdelay= 250; //time between sets
const int zoom_out=3; //Zoom 

void setup() {
pinMode(zoom_in, INPUT);
pinMode(zoom_out, INPUT);
// initialize both serial ports:
Serial.begin(9600);
//send Address set
for (int i=0; i<4; i++){
Serial.write(address_set[i]);
}
delay(thisdelay);
//send IF_clear set
for (int i=0; i<5; i++){
Serial.write(if_clear[i]);
delay(thisdelay);
}
}

//zoom in
void loop() {
int zoom_inState=pulseIn(3, HIGH, 25000);
if(zoom_inState>1550 )
{
delay(thisdelay);
//Send zoom tele set
for (int i=0; i<6; i++){
Serial.write(zoom_teleVar[i]);
}
}

//zoom out
int zoom_outState=pulseIn(3, HIGH, 25000);
if(zoom_outState < 1400 )
{
delay(thisdelay);
for (int i=0; i<6; i++){
Serial.write(zoom_wideVar[i]);
}
}
//zoom stop
if(zoom_outState < 1500 && zoom_inState > 1400 ){
//send auto focus cmd
for (int i=0; i<6; i++){
Serial.write(auto_focus[i]);
}
//send zoom stop
for (int i=0; i<6; i++){
Serial.write(zoom_stop[i]);
}
}
}

void sendcommand_cancel(){
for (int i=0; i<3; i++){
Serial.write(command_cancel[i]);
}
}

next thing will be to import it to attiny85

will release the code later tonight

**got really cool board that im using called attami (google it :) )

i was told that it will cost 1euro (not assembled)

and will be available at c31c (chaos communication congress #31)