Convert points to float in import (#1898)

* Convert points to float in import

* update changelog

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Cursor position is reset after changing a text field (<https://github.com/opencv/cvat/pull/1874>)
 - Hidden points and cuboids can be selected to be groupped (<https://github.com/opencv/cvat/pull/1874>)
 - `outside` annotations should not be in exported images (<https://github.com/opencv/cvat/issues/1620>)
+- `CVAT for video format` import error with interpolation (<https://github.com/opencv/cvat/issues/1893>)
 
 ### Security
 -

cvat/apps/dataset_manager/bindings.py

@@ -350,6 +350,7 @@ class TaskData:
         _shape['attributes'] = [self._import_attribute(label_id, attrib)
             for attrib in _shape['attributes']
             if self._get_attribute_id(label_id, attrib.name)]
+        _shape['points'] = list(map(float, _shape['points']))
         return _shape
 
     def _import_track(self, track):
@@ -368,6 +369,7 @@ class TaskData:
             shape['attributes'] = [self._import_attribute(label_id, attrib)
                 for attrib in shape['attributes']
                 if self._get_mutable_attribute_id(label_id, attrib.name)]
+            shape['points'] = list(map(float, shape['points']))
 
         return _track