How to use the vidgear.gears.helper.dict2Args function in vidgear

input_parameters = dict2Args(input_params)

		#pre-assign default encoder parameters (if not assigned by user).
		if "-vcodec" not in output_params:
			output_params["-vcodec"] = "libx264"
		if output_params["-vcodec"] in ["libx264", "libx265"]:
			if "-crf" in output_params: 
				pass
			else:
				output_params["-crf"] = "18"
			if "-preset" in output_params: 
				pass
			else:
				output_params["-preset"] = "fast"
		#convert output parameters to list
		output_parameters = dict2Args(output_params)
		#format command
		cmd = [self.ffmpeg , "-y"] + ["-f", "rawvideo", "-vcodec", "rawvideo"] + input_parameters + ["-i", "-"] + output_parameters + [self.out_file]
		#assign value to class variable
		self.cmd += " ".join(cmd)
		# Launch the FFmpeg process
		if self.logging:
			print(self.cmd)
			# In debugging mode
			self.process = sp.Popen(cmd, stdin=sp.PIPE, stdout=sp.PIPE, stderr=None)
		else:
			# In silent mode
			self.process = sp.Popen(cmd, stdin=sp.PIPE, stdout=self.DEVNULL, stderr=sp.STDOUT)

def startFFmpeg_Process(self, input_params, output_params):

		"""
		Start FFmpeg process

		:param input_params (dict): Input parameters
		:param output_params (dict): Output parameters
		"""

		#convert input parameters to list
		input_parameters = dict2Args(input_params)

		#pre-assign default encoder parameters (if not assigned by user).
		if "-vcodec" not in output_params:
			output_params["-vcodec"] = "libx264"
		if output_params["-vcodec"] in ["libx264", "libx265"]:
			if "-crf" in output_params: 
				pass
			else:
				output_params["-crf"] = "18"
			if "-preset" in output_params: 
				pass
			else:
				output_params["-preset"] = "fast"
		#convert output parameters to list
		output_parameters = dict2Args(output_params)
		#format command