KinFu render() error (python3.8)

[DumDereDum]

System information (version)

• OpenCV => 4.2
• Operating System / Platform => Windows 64 Bit
• Compiler => Visual Studio 2019 (for building python library)
• PyCharm 2020.3
• Python 3.8

Detailed description

Python version of kinfu.render works only with 2 args, while it should work with 1 and with 2

Steps to reproduce

```
params = cv2.kinfu_Params.defaultParams()
kf = cv2.kinfu_KinFu.create(params)
flag = kf.update(depth)
size = height, width, 4
cvt8 = np.zeros(size, dtype=np.uint8)
kf.render(cvt8)
```

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  answers.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc