How to add background in webcam using python and opencv

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I am trying to add video as background when (like this video https://www.youtube.com/watch?v=G_AVZ... am connecting to webcam. For this i did Background extraction first in this code i folow these steps

• First it will read the data from videos by using "VideoCapture"
• Next create and update the background model by using "createBackgroundSubtractorMOG2()" class because i am using opencv3
• Finally it will get and show the foreground mask by using "imshow"
• Then i added the background to the webcam
• It is not capturing frames in color In this the video is added as background but the webcam captures the frames in gray.

How to capture the frames in color and i am attaching my code and i tried using convert from grayscale to RGB but it is not working.

I am getting error like

\color.cpp:10655: error: (-215) scn == 1 && (dcn == 3 || dcn == 4) in function cv::cvtColor And here is my code

import cv2 
import numpy as np

cap=cv2.VideoCapture(0)

fgbg=cv2.createBackgroundSubtractorMOG2()
history = 100

background_capture = 
cv2.VideoCapture('/house.mp4')

while True:

frame = get_frame(cap, 0.5)

ret, background = background_capture.read()
background=cv2.resize(background, (640,480), interpolation = 
cv2.INTER_AREA)
ret, frame = cap.read()
   # gray=cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
mask=fgbg.apply(frame,learningRate=1.0//history)
#convert from grayscale to RGB
gray=cv2.cvtColor(frame, cv2.COLOR_GRAY2RGB)


bitwise= cv2.bitwise_and(background,background, mask = mask)
gaussian = cv2.GaussianBlur(bitwise, (5, 5), 10)
add=cv2.add(background,gaussian)
add=cv2.resize(add, (1366,768), interpolation = cv2.INTER_AREA)



cv2.imshow('add',add)

k=cv2.waitKey(30) & 0xff
if k==27:
   break

cap.release()
cv2.destroyAllWindows()