Got it working now:
def grab_image() :
ret_val, img = cap.read()
img_col = cv2.cvtColor(img,cv2.COLOR_BGR2RGB)
pil_img = PImage.fromarray(img_col.astype('uint8'), 'RGB')
pil_img = pil2tensor(pil_img,np.float32)
inf_img = Image(pil_img.div_(255))
return(inf_img, img)