Safari Warning: Possible Phishing Site - Send http request to an IFRAME ( Javascript )

Question

I am trying to perform action in iframe that not visible to the user ( width 1 height 1 ). The following action(Javascript) is related to Webcam API:

function down(){
ifrResult.location = "http://"+user+":"+password+"@"+ip+":"+port+"/decoder_control.cgi?command=2&onestep=5";
}
function up(){
ifrResult.location = "http://"+user+":"+password+"@"+ip+":"+port+"/decoder_control.cgi?command=0&onestep=5";
}

As you can see the iframe id is ifrResult.

Problem:
On Chrome browser the action is performed without any issues but on Safari I get an error:

Does anyone faced with this issue before? suggestions are welcomed, Thanks!

EDIT
For the avoidance of doubt, this is legal operation its just a wrapper for Webcam interface.